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21. Biology 403 - Spring '96 - Profs. Eernisse & Jones
Jump to Links for sponges, cnidarians, Bilaterians, Flatworms, Pseudocoelomates, Coelomates, Priapulida (Phallus worms) Model of Fossil Priapulid
Visit the source of this page's Featured Image at: The Tree of Life Project
Animal WWW Links
Jump to Links for Sponges, Cnidarians, Bilaterians, Flatworms, ...
Search the WWW for Any Keyword with Yahoo!
Metazoa (Multicellular Animals)
-Metazoans Without Tissues
Porifera (sponges)
Porifera Home Page
Porifera: Model of Ancient Sponge Reef
Porifera: Image of Sponge Spicules ...
Underwater image of sponge
-Eumetazoa (Tissues and Body Symmetry)
Cnidaria features
Anthozoa (coral, anemones)
Corals and coral reefs
Fossil coral ("petosky stone" 300+ mya) ...
Myxozoans are Cnidarians!
Introduction to ctenophores
Drawings of ctenophores
Underwater image of ctenophore
-Bilateria (Bilateral Symmetry)
Acoelomata (no coelom)
Platyhelminthes (flatworms)
Platyhelminthes: Drawings of flatworms
Platyhelminthes: Free-living flatworm
Gnathostomulida: Model of a Jaw Worm
Pseudocoelomata (false coelom)
Nematoda (roundworms)
Nematoda: Research on C. elegans
Nematomorpha (horsehair worms)
Rotifera (rotifers) ...
Life between sand grains quiz
Coelomata (coelomate animals)
Nemertea (ribbon worms)
Sipuncula (peanut worms)
Echiura (fat innkeeper, etc.)

22. Web Links By Group Of Organisms - Prof. Eernisse
Unicellular Eukaryotes, Plants, Fungi, sponges, cnidarians, Bilaterians, Echiura and Sipuncula Drawings Pogonophora (Including Hot Vent worms)
Visit the source of this page's Featured Image at: Home Page of Expert on Fossil Whales, Mark Uhen
Web Links by Group of Organisms
Jump to Links for Microorganisms, Viruses, Unicellular Eukaryotes, Plants, ...
Show Marine Biology Links by Topic
Search the WWW for Any Keyword with Lycos Yahoo WebCrawler Metacrawler ... Alta Vista , or Excite
Find Something Cool? Send a Suggested Link.
-Microorganisms, Extraterrestrial ?Life
The Microbial Underground!
Microbes: Distinguish Bacteria, Archaea, Fungi, Protists, and Viruses
Methanogens and Other Microbes
Image of Cyanobacteria ...
A More Dubious Martian Life Form
Virus or Bacterium?
Virology on the WWW
Virus Images by Genome Type
Virus Images by Family ...
HIV Virus Explained
-Unicellular Eukaryotes
Protist Image Data
Prof. Fankboner's Selected Images of Protozoans
Radiolarian Skeletons ...
Chlorophyta: Desmids
-Green Plants
Botany Resources
Plant Families
California Flora Database
Southern California Plant Families ...
Arkansas Diversity Mapper
Mycological Links
The Fission Yeast Site
Metazoa (Multicellular Animals)
-Metazoans Without Tissues
Porifera (sponges)
Porifera Web Page
Porifera: Prof. Fankboner's Selected Images

23. First Life
metazoa can be grouped in three basic categories spongelike animals, cnidarians, and worms. The sponges, and cnidarians (corals and sea anemones),


Stromatolites are layered mounds, columns, and sheets found in the rock. They were originally formed by the growth of layer upon layer of cyanobacteria , a single-celled photosynthesizing microbe growing on a sea floor. Cyanobacteria are prokaryotic cells (the simplest form of modern carbon-based life) which lack a DNA-packaging nucleus. This simple organism would be the only life on Earth for the next 2 billion years. Very rarely, stromatolites are still forming today in places such as Shark Bay, Australia. The salinity of the water is very high in this bay, and basically the only life that can survive is cyanobacteria. Under normal ocean conditions, the cyanobacteria would be eaten by marine creatures such as snails. In this special case however, columns and mounds are forming as can be seen in the picture to the left. The first multi-celled animals (metazoa) evolved over 600 million years ago. Primitive metazoa can be grouped in three basic categories: sponge-like animals, cnidarians, and worms. The sponges, and cnidarians (corals and sea anemones), are the most primitive with about 11 specialized cell types. Worms and higher metazoa have approximately 55 specialized cells.
Sponges Sponges are the simplest grade of multi-celled animals. In general, sponges have open-topped, sack-like bodies which are fixed to the sea floor. Water is pulled through the body, and food is filtered out.

sponges and cnidarians are two layers thick; Sponge cells don t form tissues, Mollusks and Segmented worms. One shelled mollusks are called gastropods
TWO PAGE-OUTLINE EXAMPLES Ch.12 Science Pages 338-339 Mrs. Dacuyan's Seventh Grade Class Kenny Neely,
  • What is an animal? Animals many celled find and digest their own food Invertebrates and Vertebrate Invertebrates are animals without backbones Vertebrates are animals with backbones Bilateral, Radial and No Symmetry Animals that have body parts arranged the same way on both sides have bilateral symmetry (like humans) Animals with body parts arranged in a circle around a central point have radial symmetry (like a seastar) Animals with no definite shape are called asymmetrical Sponges, Cnidarians, Flatworms and Roundworms Sponges and Cnidarians Are only two layers thick Sponge cells do not from tissues, organs or organ systems Cnidarian bodies have tissues and have radial symmetry Flatworms and roundworms Both have bilateral symmetry Both have parasitic and free-living members Mollusks and Segmented Worms Mollusks Mollusks with one shell are gastropods Mollusks with two shells are bivalves Cephalopods Have a foot divided into tentacles They have no outside shell They have a closed circulatory system Annelids Have a body cavity that separates the internal organs from the body wall They have setae, bristle-like structures that help annelids move
  • 25. Sponges Marine Worms Coral Reef Ecology Guide - Thailand Similan Burma
    sponges Marine worms coral reef ecology guide Thailand Similan Burma fishes, cnidarians, sponges marine worms, crustaceans, molluscs, echinoderms and

    Liveaboard Cruises
    Day Trips PADI Diving Courses PADI IDC - CDC ... Reptiles
    SPONGES (Spongia)
    GREAT VASESPONGE (Xestospongia testudinaria) Length: to 70 cm
    This species often hosts a variety of other organisms like crabs, shrimps, worms and fishes. They use the sponge to gain access to plankton-rich currents passing above. MARINE WORMS
    CHRISTMAS TREE WORM (Spirobranchus giganteus) Height: to 3 cm
    Because of its bright colors, this worm is very popular with divers. Settles in big colonies on hard corals of the species Porites. This species is ultra sensitive to light and pressure changes. When disturbed they are quickly withdrawn into the tube. Welcome Cartilaginous Fishes Bony Fishes Cnidarians ... Reptiles
    Dive Asia - Phuket Thailand Office Address:
    24 Karon Rd., Kata Beach, Phuket 83100, Thailand

    26. The Cambrian Radiation And Other Associated Stuff
    In contrast to sponges and cnidarians, worms have evolved complex organ systems made from specialised cells. All sponges and most cnidarians are attached to
    The Evolution of Animals
    Eukaryotes come in two grades of organization: single-celled (protists) and multicellular (plants, animals, and fungi). The world today is full of complex multicellular plants and animals: how, why, and when did they evolve from protists?
    Proterozoic Protists
    A single-celled eukaryote or protist can carry chlorophyll (it can be an autotrophic, photosynthetic, "alga"), it can eat other organisms (it can be an organotrophic, "protozoan" "animal"), or it may do both. We know that a very diverse array of plankton existed by 800 Ma, because they are known as fossils. Acritarchs are spherical microfossils with thick and complex organic walls. They are probably dinoflagellates that spent most of their life floating in the plankton. But many amoebalike protists do not have cell walls made of cellulose and so do not preserve well. It's possible that while the surface layers of Proterozoic oceans had huge numbers of floating plankton, Proterozoic seafloors were crawling with successful populations of protists consuming the rich food supplies available in bacterial mats.
    Evolving Metazoans from Protists: Anatomy and Ecology
    A flagellate protist is a single cell with a lashing filament, a flagellum (plural, flagella), that moves it through the water. A sponge is the simplest multicellular variation on this theme. It contains many similar flagellated cells arranged so that they generate and direct water currents efficiently. Sponges are more advanced than simple colonies of choanoflagellates because they also have specialized sets of cells to form a body wall, to digest and distribute the food they collect, and to construct a stiffening skeletal framework of organic or mineral protein that allows them to become large without collapsing into a heap of jelly. Sponges are thus

    27. PH@School: Biology: Student Chapter 26
    You will examine trends in animal evolution and then review the form and function of sponges, cnidarians, and unsegmented worms. Chapter Outline
    In this chapter you will begin your exploration of the animal kingdom by learning about primitive invertebrate animals. You will examine trends in animal evolution and then review the form and function of sponges, cnidarians, and unsegmented worms.
    In this chapter, you will:
    • describe some trends in animal evolution describe the structure of a sponge discuss how sponges perform essential functions describe the structure of a cnidarian discuss how cnidarians perform essential functions discuss how unsegmented worms perform essential functions

    28. Planet Diary - Textbook Correlations
    Chapter 1 sponges, cnidarians, and worms. The World s Coral Reefs. Chapter 3 Fishes, Amphibians, and Reptiles. The World s Coral Reefs
    Book A: From Bacteria to Plants
    Chapter 1: Living Things
    Endangered Species in Your State
    The World's Coral Reefs
    Chapter 2: Viruses and Bacteria
    Cellular Invaders
    Preparing for a Trip
    Chapter 3: Protists and Fungi
    Toxins Found in Microscopic Flora
    Book B: Animals
    Chapter 1: Sponges, Cnidarians, and Worms
    The World's Coral Reefs
    Chapter 3: Fishes, Amphibians, and Reptiles
    The World's Coral Reefs
    Chapter 4: Birds and Mammals
    Endangered Species in Your State
    Book C: Cells and Heredity
    Chapter 1: Cell Structure and Function
    Cellular Invaders
    Chapter 2: Cell Processes and Energy
    Radiation and You
    Book D: Human Biology and Health
    Chapter 1: Healthy Body Systems
    Preparing for a Trip
    Chapter 2: Bones, Muscle, and Skin
    UV Light, CFCs, and the Ozone Layer
    Chapter 3: Food and Digestion
    Toxins Found in Microscopic Flora
    Chapter 4: Circulation
    Cellular Invaders
    Chapter 5: Respiration and Excretion
    Photochemical Smog
    Chapter 6: Fighting Disease
    Cellular Invaders
    Toxins Found in Microscopic Flora

    Mercury in the Environment
    Chapter 7: The Nervous System
    Mercury in the Environment
    Book E: Environmental Science
    Chapter 2: Ecosystems and Biomes
    The World's Coral Reefs
    How Wildfires Affect an Ecosystem
    Chapter 4: Land and Soil Resources
    Radiation and You
    Mercury in the Environment
    Chapter 5: Air and Water Resources
    Acid Rain
    Photochemical Smog

    Monitoring River Levels

    Oil Spill Preparation and Recovery
    Mercury in the Environment
    Chapter 6: Energy Resources
    Fossil Fuels and the Greenhouse Effect Pearson Education, Inc

    29. Single Subject Science Credential Course Listing
    3521 lower invertebrates including protozoa, sponges, cnidarians and worms. Biology 3522 higher invertebrates including mollusks, arthropods,
    Course Descriptions This information will help you match the courses you have taken with those required by the breadth and/or depth disciplines. Please use the worksheets ( Biology Chemistry Geology, Physics or Breadth ) to record the matches of the required courses with courses you have successfully completed. Required Breadth Courses
    BIOL 1401, 2, 3 Foundations of Biological Sciences (5,5,5)
    BIOL 1401 Introduction to molecular and cellular biology with emphasis on the integration of structure and function in the living cell as a biological system; cellular aspects of inheritance. Four hrs. lect., 3 hrs. lab.
    BIOL 1402 An introduction to plant biology with emphasis on relationship of structure and function in plants, principles of classification and ecology, and a brief survey of the plant kingdom, including evolutionary relationships. Prerequisite: BIOL 1401 or consent of instructor. Four hrs. lect., 3 hrs. lab.
    BIOL 1403 An introduction to animal biology with emphasis on relationship of structure and function in animals, principles of classification and ecology, and a brief survey of the animal kingdom, including evolutionary relationships. Prerequisites: BIOL 1401 and 1402 or consent of instructor. Four hrs. lect., 3 hrs. lab.
    CHEM 1101, 2, 3

    30. Proterozoic Era
    sponges, cnidarians, and worms. These three groups clearly have a common Protist ancestor which was probably a single celled flagellate organism.
    Proterozoic Era 543 - 2500 mya Oxygen - the First Case of Pollution? Oxygen, the waste product of this, built up in the atmosphere reaching 1% of the atmosphere by 2 billion years ago. Uranites UO Can only accumulate at O levels lower than 1%. Not found in rocks younger than 2300 mya Red Beds Iron Oxides date from 2300 mya Decline in Banded iron beds rare after 1800 mya Sedimentary copper deposits appear in 1700 mya NB copper only found in proteins of eukaryotes. A More Efficient Metabolism In the presence of free O a new form of respiration evolved which was much more efficient than anaerobic respiration Aerobic respiration is significantly more efficient than anaerobic respiration 36 vs. 2 ATP Evolution of the nucleus Packaged DNA is protected form damage - elaborate cellular mechanisms exist to protect the DNA one the simplest is the nuclear membrane The oldest fossils of Eukaryotes are about 1.2 billion years old They were probably anaerobic Archezoans These protists lack both mitochondria and plastids E.g.

    31. Age Of Animals
    Some of those shown in the drawing are sponges, cnidarians, worms, trilobites, anomalocaris, marrella, hallucigenia, sea scorpions, and brachiopods.
    Age of Animals
    Vendian Period, 600-540MYA
    Period, 540-500 MYA (new timescale)
    Period, 500-425 MYA
    Period, 425-408 MYA
    Period, 408-362 MYA
    Period, 362-290 MYA
    Period, 290-245 MYA
    Period, 245-208 MYA
    Period, 208-145 MYA
    Period, 145-65 MYA
    Period, 65-1.64 MYA Quaternary Period, 1.64 MYA - present MYA = million years ago, FA = first appearance.
    Vendian Period, 600-540 MYA
    For most of the nearly 4 billion years that life has existed on Earth, evolution produced little beyond bacteria, plankton, and multi-celled algae. But beginning about 600 million years ago in the Precambrian, the fossil record speaks of more rapid change. First, there was the rise and fall of mysterious creatures of the "Vendian biota" or "Ediacara fauna" (see Figure 01a), named for the fossil site in Australia where they were first discovered. The question of what these fossils are is still not settled to everyone's satisfaction; at various times they have been considered algae, lichens, giant protozoans, or even a separate kingdom of life unrelated to anything living today. Some of these fossils are simple blobs that are hard to interpret and could represent almost anything. Some are most like cnidarians, worms, or soft-bodied relatives of the arthropods. Others are less
    Figure 01a Ediacara Fauna [view large image]
    Cambrian Period, 540-500 MYA

    32. New Jersey Scuba Diver - Marine Biology - Plant-like Animals
    Bryozoans; Tube worms; Barnacles. sponges; Sea Squirts Hydroids, the most primitive cnidarians, show the most even division between polyp and medusa
    Biology Introduction Contents Classification Slideshow ...
    Plant-like Animals All these are animals that, in a sense, occupy the physical niche of the plants which are missing from the deeper parts of the marine environment. All are filter-feeders, straining plankton from the surrounding waters.
    Frilled Anemones
    bloom on a shipwreck. Corals anemones , and hydroids are Cnidarians , ( pronounced nee-darian ) all closely related to jellyfishes . Most Cnidarians alternate a generation of the sessile polyps shown here with a generation of mobile medusae or jellyfish . Thus many medusas and polyps are actually the same species, merely in different generations. This is how seemingly fixed corals medusa , but for the majority it is not known.
    Cnidarian lifecycle - in this case, a hydroid . Others are similar.
    The actual stinging apparatus of a cnidarian is microscopic - specially developed cells.
    In anemones and corals the polyp stage is dominant. Most reproduction is by asexual budding or splitting of polyps, creating colonies of clones, with only occasional long-range dispersal by the small sexual

    33. Invertebrates
    4 cnidarians are also simple aquatic animals like sponges, They can be divided into three classes bristle worms, earthworms, and leeches.
    Sample Invertebrates Worksheet
    Animal Worksheets

    Return to Invertebrates Worksheets Subscribers:
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    Invertebrates With over 2 million known animal species on Earth, 98% of them are invertebrates. Invertebrates are animals that don't have backbones. They live in a variety of environments, from hot and unbearable deserts to frigid and equally unbearable polar regions. They also come in an assortment of shapes and colors. To better understand invertebrates, scientists group them into eight major categories. Here are the categories and a fact or two about each category:
    Arthropods are invertebrates with hard outer shells (exoskeletons), with jointed legs, and with segmented bodies. Since about 75% of all animal species are arthropods, they represent the largest invertebrate group. Insects (such as butterflies, fleas, and beetles), myriapods (such as centipedes and millipedes), crustaceans (such as crabs, pill woodlice, and lobsters), arachnids (such as spiders, scorpions, and ticks), and horseshoe crabs are all examples of arthropods.
    Sponges are the simplest of all animals. Inhabiting mostly oceans but occasionally freshwater, they are headless and nerveless. As their movement is very difficult to detect, and they always attach to rocks, sponges were once thought to be aquatic plants! Sponges feed through a filter system. Thousands of pores covering the outside of a sponge pump water into the sponge's body. Collar cells lining the inside of the sponge sort out planktons or other microorganisms from the water. Once food particles are trapped and digested by collar cells, sponges expel the water through an opening at the top of the sponge.

    34. Arctic Ocean Biodiversity: Sea Bottom
    sponges, cnidarians, tunicates, brittle stars and various worms are also found, but they are less frequent. The Arctic deepsea animals occur in low
    Arctic Ocean Biodiversity
    Home Sea Ice Water Column Sea Bottom Fish Outreach Helpful Links Bluhm/Macdonald (NOAA Ocean Exploration) Protists
    (uni-cellular organisms) v.Juterzenka (AWI) Porifera
    (sponges) Piepenburg/v.Juterzenka/Schmid (IPOE) Cnidarians
    (sea anemones)
    Piepenburg/v.Juterzenka/Schmid (IPOE) Bryozoans
    Bluhm/Macdonald (NOAA Ocean Exploration) Nematoda
    (round worms)
    Bluhm/Macdonald (NOAA Ocean Exploration) Various other worms
    Bluhm/Macdonald (NOAA Ocean Exploration) Bivalves
    Piepenburg/v.Juterzenka/Schmid (IPOE) Gastropods
    (snails) Bluhm/Macdonald (NOAA Ocean Exploration) Scaphopods (tusk shells) Bluhm/Macdonald (NOAA Ocean Exploration) Polychaeta (bristle worms) Harpacticoid copepods Bluhm/Macdonald (NOAA Ocean Exploration) Amphipods (sand fleas) Bluhm/Macdonald (NOAA Ocean Exploration) Cumaceans Bluhm/Macdonald (NOAA Ocean Exploration) Tanaids Bluhm/Macdonald (NOAA Ocean Exploration) Isopods Bluhm/Macdonald (NOAA Ocean Exploration) Decapods (shrimps and others) Piepenburg/v.Juterzenka/Schmid (IPOE) Other Arthropods Piepenburg/v.Juterzenka/Schmid (IPOE)

    35. Science 6
    sponges, cnidarians, Flatworms, and Roundworms Identify flatworms and roundworms as two phyla of worms and give examples of each. VOCABULARY sponge
    Invertebrate Animals
    What is an animal?

    1. Explain what makes an animal an animal.
    2. Explain the difference between radial symmetry and bilateral symmetry.
    VOCABULARY: organelles, eukaryotic cells, predator, asymmetrical
    Sponges, Cnidarians, Flatworms, and Roundworms

    1. Describe the body of a sponge.
    finger sponge (photo from Gray's Reef National Marine Sanctuary, Savannah, GA) 2. Explain how sponges get food. 3. Identify animals that are classified as cnidarians. 4. Identify flatworms and roundworms as two phyla of worms and give examples of each. VOCABULARY: sponge, collar cells, flagella, cnidarian, spicules, nematocysts, polyp, medusa, sessile, parasite, host, planarian SECTION THREE Mollusks and Segmented Worms red octopus in Puget Sound 1. Identify common characteristics of mollusks. 2. Explain the differences between gastropods, bivalves, and cephalopods. 3. Identify segmented worms as a third phyla of worms and give examples. earthworm VOCABULARY: mollusk, mantle, secrete, gills, radula, open circulatory system, closed circulatory system, siphon, annelids, setae, gizzard, mucus

    36. Mr. Waite S Science Class
    PNL for Zoology 4 Protista, sponges, Cnidaria January 31 (Simple Animalssponges, cnidarians, Flat worms, Round worms); February 7 (Segmented worms

    37. Orrville High School
    Annelids Segmented worms pages 733 - 737 Unit Title, Chapter 35 - sponges, cnidarians and Ctenophores - pages 692 - 703
    Subject: Biology Lesson Plans for the Week of: May - 2 - 05 Teacher: Curtis MONDAY Unit Title Chapter 35 and 36 Objective All above from the 2 chapters Activity Taking of Chapter Tests Assessment Graded Test TUESDAY Unit Title Chapter 37 - Sec. Annelids - Segmented Worms pages 733 - 737 Objective Explain how earthworms move, describe their system of organs, distinguish between the three classes of annelids Activity Notes, Packet section 2 chapter 37 Assessment Graded work and test chapter 37 WEDNESDAY Unit Title Chapter 37 - Sec. Annelids - Segmented Worms pages 733 - 737 Objective Explain how earthworms move, describe their system of organs, distinguish between the three classes of annelids Activity Disection of earthworm Assessment Graded work and test chapter 37 THURSDAY Unit Title Chapter 37 - Section - Mollusca pages 724 - 732 Objective Identify features shared by mollusks,Describe the structure and function of the Radula Activity Notes and Packet section 1 Assessment Test chapter 37 FRIDAY Unit Title Chapter 37 - Section - Mollusca pages 724 - 732 Objective Name the characteristics of the 4 classes od mollusks Activity Disection of clam Assessment Test chapter 37 Subject: Biology Lesson Plans for the Week of:April 18 - 2005 Teacher: Curtis MONDAY Unit Title Chapter 35 - Section 2 -Cnidarians- pages 696 - 702 Objective Name and describe the two Cnidarian body types,List the characteristics of Cnidarians,Identify 3 groups of Cnidarians

    38. A Response To Morton
    Ediacaran fauna to jellyfish (cnidarians) and worms, Conway Morris says In turning his attention away from sponges and cnidarians, Conway Morris
    Letter to the Editor A Response to Morton's Critical Review of Creation, Evolution, and Modern Science Ray Bohlin Executive Director Probe Ministries
    1900 Firman Dr., #100 Richardson, TX 75081
    PSCF (June 2001): 137-139. G lenn Morton offered a review of the book, Creation, Evolution, and Modern Science PSCF 53 [March 2001]: 63-4), which I edited and wrote most of the chapters. Even a cursory reading of the book itself will allow most to realize that Morton's negative and hostile review fails to reflect accurately the book's intent, content, and audience. I offer a few rebuttals and will let the reader decide how to interpret Morton's other comments. It seems clear to me that Morton expects any book dealing with scientific issues to be written on a scientific scholarly level. My experience has been that this approach turns the scientific novice away, therefore defeating the purpose of education. First, I will address Morton's factual charges and then answer his concern of the level of scholarship. Morton chides me for not quoting from Cambrian explosion authority Simon Conway Morris's 1998 book

    39. Test
    Invertebrates sponges, cnidarians, worms, insects, crustaceans, arachnids Vertebrates fishes, amphibians, reptiles, birds, mammals
    Mr. Jacobs Web Site 7th Grade "Organization is the Key to Success" - " Practice Makes Permanent" - "Be Nice and Work Hard" Click on a tab to take you where you want to go! Metric System, significant figures, Calculation Problems weathering, erosion, deposition, wind, waves, glaciers PowerPoint, Geologic time PowerPoint, Cell membrane lab sponges, cnidarians, worms, insects, crustaceans, arachnids fishes, amphibians, reptiles, birds, mammals PowerPoint, meiosis skeletal, muscular, circulatory, digestive, reparatory, nervous First Semester Exam Information Disease Project information sheet Webquest! Sites for your individual component How to arrange your disease project folder (individual component) Invent Cool Tools! Craftsman- NSTA "Young Inventors Awards Program" Click here for Rules and Entry Form Information Measurement Unit How much do I weigh on the moon? Metric System "Powers of 10" Review for Test Water, Weathering, Erosion, Paleontology Unit Sand Hills Laboratory Information "Problem, Materials, Procedure" (page 70)

    40. ACS Distance Education - ACS Correspondence Courses
    Introduction Simple Organisms (Protists, sponges etc); Marine Plants; cnidarians worms. Anemones; Jellyfish; Crustaceans; Flatworms

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