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Definition
| Animals that do not have a backbone. |
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| Animals that have a backbone. |
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| Process in which the product or result stops or limits the process. |
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| Hollow ball of cells formed when a zygote undergoes a series of divisions. |
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| An animal whose mouth is formed from from the blastopore. |
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Definition
| An animals whose anus is formed from the blastopore. |
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| Opening through which wastes leave the digestive tract |
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Definition
| Innermost germ layer, develop into the linings of the digestive tract and much of the respiratory system. |
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Definition
| Middle germ layer of most animals; gives rise to muscles and much of the circulatory,k reproductive, and excretory organ system. |
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| Outermost germ layer of most animals; gives rise to outer layer of the skin, sees organs and nerves. |
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| Body plan in which body parts repeat around the center of the body; characteristic of seas anemones and sea stars. |
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Definition
| Body plan in which only a single, imaginary line can dived the body into two equal haves; characteristics of worms, arthropods, and chordates. |
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| Concentration of sense organs and nerve cells at the front end of the body. |
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| Specialized cell in sponges that uses a flagellum to move a steady current of water through the sponge. |
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| Large hole at the top of the sponge through which water leaves the sponge. |
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| Spike-shaped structure that makes up the skeletons of harder sponges; made of either calcium carbonate or silica. |
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| Specialized cell in a sponge that makes spicules. |
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Definition
| Process in which eggs are fertilized inside the female's body. |
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Definition
| Immature stage of an organism that looks different from the adult form. |
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| Group of archaeocytes surrounded by a tough layer of spicules; produced by some sponges. |
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| Stinging cell of cnidarians; used for defense and to capture prey. |
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Definition
| Stinging structure within each cnidocyte of a cnidarian that is used to poison or kill prey. |
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Definition
| Motile stage of the life cycle of a cnidarian that has a bell-shaped body. |
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Definition
| Digestive chamber with a single opening, in which cnidarians, flatworms, and echinoderms digest food. |
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Definition
| Loosely organized network of nerve cells that together allows cnidarians to detect stimuli. |
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Definition
| Layers of circular and longitudinal muscles, together with the water in the gastrovasculer cavity, that enable movement. |
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Definition
| Process in which eggs are fertilized outside the female's body. |
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