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15 Cards in this Set
- Front
- Back
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arrangement of individual body parts (radial – arranged around a central point; bilateral – mirror-image; or asymmetrical – no definite body shape)
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symmetry
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an animal without a backbone
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invertebrate
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radially symmetrical, hollow-bodied animals with two cell layers organized into tissues
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cnidarian
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vase shaped, usually sessile (attached in one spot) body form in the life cycle of a cnidarian
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polyp
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free-swimming, bell-shaped body form in the life cycle of a cnidarian
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medusa
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soft-bodied, bilaterally symmetrical invertebrate with a large, muscular foot, a mantle, and an open circulatory system; usually has a shell.
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mollusk
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thin layer of tissue that covers a mollusk’s body and that can secrete a shell
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mantle
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organ that allows a water-dwelling animal to exchange carbon dioxide for dissolved oxygen in the water
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gill
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scratchy, tonguelike organ in many mollusks that has rows of teethlike projections used to scrape and grate food
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radula
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a type of blood-circulation system that lacks blood vessels and in which blood washes over the organs
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open circulatory system
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a type of blood-circulation system in which blood is transported through blood vessels rather than surrounding the organs
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closed circulatory system
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bilaterally symmetrical animal with jointed appendages, a protective exoskeleton, and a segmented body
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arthropod
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structure such as a claw, leg, or antenna that grows from the body
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appendage
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rigid, protective body covering of an arthropod that supports the body and reduces water loss
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exoskeleton
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change of body form that can be complete (egg, larva, pupa, adult) or incomplete (egg, nymph, adult)
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metamorphosis
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