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| all concentration of sensory structures and nerve cells in head. |
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| peritoneum-lined cavity between the gut and body wall of most animals. |
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| body wall, protection. Annelids- thin flexible coat.Arthopods- lightweight exoskeletion hardened with proteins and chitin |
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| inner skin layer; inner gut lining |
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| animal that filters food through currents of water flowing through body parts |
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| animal with bilateral symetery; anus forms through first indention in embryo |
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external skeleton, like the hardened cuticle of an arthopod |
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individual having both male and female gonads gonad- primary reproductive organ in which animal gametes are produced |
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| heterotroph that feeds on other organisms, does not live in or on them and may or may not kill them |
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| one of many small tubes that allow land dwelling insects to dispose of toxic waste without losing water |
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animal body plan having 4 or more equal parts around a central axis, like a sea anenome |
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| primary tissue layer for all large complex animals, gives rise to many internal organs |
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| body plan with axis from anterior to posterior ends;seperated from right and left side, and dorsal and ventral surface |
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| major changes in froms of diffrent animals |
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| in sponge body wall, a flagellated cell with a collar of food trapping villi |
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| unable to make its own organic compounds and feeds on autotrophs, othr heterotrophs and organic wastes |
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| the hole in a sponge where the water exits |
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| animal tissue that covers external surfaces and lines internal cavities and tubes. 1 surface is free and the other lies on a basement membrane |
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| cnidarian capsule that has a dischargeable tube shaped thread sometimes barbed; releases a toxin or sticky substance |
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rod of stiffened tissue that supports the body |
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| prominent longitudial nerve; most animals have 1, 2 or 3.Chordate nervous systems arose from the dorsal nerve cord |
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| simple nervous system in epidermis of cnidarians and some other invertabrae |
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