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Definition
| invertebrates with no symmetry and no tissues or organs |
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| structure built by dead or dropped cnidarian shells |
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| flat worms that are soft, can be parasitic or free-living, and have one opening |
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| round worms that have a two opening digestive system |
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| worm made of segments, more advanced parts, and a closed circulatory system |
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Definition
| A group of similar cells that perform a specific function |
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Definition
| a group of several different tissues |
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| One of about 35 major groups into which biologists classify members of the animal kingdom. |
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| animals without backbones |
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Definition
| Line symmetry; the quality of being divisible into halves that are mirror images. |
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| The quality of having many lines of symmetry that all pass through a central point. |
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| an immature form of an animal that looks very different from the adult |
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Definition
| invertebrates that have stinging cells and take food into a central body cavity |
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| A cnidarian body plan characterized by a vaselike shape and usually adapted for a life attached to an underwater surface. |
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| A cnidarian body plan characterized by a bowl shape and adapted for a free-swimming life. |
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| a group of many individual animals |
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| An organism that does not live in or on other organisms. |
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Definition
| they feed on dead or decaying material |
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Definition
| The opening at the end of an organism’s digestive system through which wastes exit. |
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Term
| closed circulatory system |
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Definition
| blood moves only within a connected network of tubes called blood vessels |
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