81. Insect --  Britannica Online Encyclopedia Britannica online encyclopedia article on insect any member of the largest class of the phylum Arthropoda, which is itself the largest of the animal phyla. http://www.britannica.com/eb/article-9105953/insect

var britAdCategory = "other"; Already a member? LOGIN Encyclopædia Britannica - the Online Encyclopedia Home Blog Advocacy Board ... Free Trial Britannica Online Content Related to this Topic This Article's Table of Contents Expand all Collapse all Introduction General features Appearance and habits Distribution and abundance Importance Role in nature Commercial significance Insects as a source of raw materials Insect damage to commercial products Agricultural significance Ecological factors Damage to growing crops Medical significance Control of insect damage Natural history Life cycle Egg Types of metamorphosis Types of larvae Role of hormones ... Reproduction Sensory perception and reception Touch Sound Chemicals Sight Behaviour Instincts Insect societies Ecology Terrestrial insects Aquatic insects Protection from enemies Population regulation Form and function External features Cuticle Head Thorax Abdomen Internal features Digestive system Circulatory system Respiratory system Reproductive system ... Eyes Evolution and paleontology Origin of insects Insect fossil record Insect phylogeny Evolution Wings and flight Metamorphosis Feeding methods Continuing evolution Classification Distinguishing taxonomic features Annotated classification Critical appraisal Additional Reading General and classification Insect form Insect physiology and biochemistry Insect behaviour and communications ... Print this Table of Contents Linked Articles Coleoptera beetles Lepidoptera moths ... Diptera Shopping New! Britannica Book of the Year

82. Insect - MSN Encarta Insect, small, airbreathing animal characterized by a segmented body with three main parts—head, thorax, and abdomen. In their adult forms, http://encarta.msn.com/encyclopedia_761576664/Insect.html

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