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Definition
| Animals that do not possess a backbone |
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Definition
| Animals that possess a backbone |
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Definition
| A large opening one a sponge through which filtered water is expelled |
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Definition
| A group of cells surrounded by a shell made of spicules |
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Definition
| An immature stage of an animals that appears different from the adult stage |
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Definition
| A complete morphological change from larval to adult form |
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Definition
| A body form in which any cut through the organism's center results in identical halves |
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Definition
| A body form in which any longitudinal cut (along the length) through the organisms's central axis results in identical halves |
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Definition
| A body form in which only one longitudinal cut through the organism's center results in identical halves |
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Definition
| An attached cnidarian stage, appearing sac-like or barrel-like |
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Definition
| A free-swimming cnidarian stage, appearing bell-like or umbrella-like |
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Definition
| A jelly-like substance between the inner layer and outer layer of cells in a cnidarian |
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Definition
| Referring to the top (or back) surface of an area |
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Definition
| Referring to the bottom (or belly) surface of an animal |
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Definition
| A relationship between two or more organisms of different species where both benefit from the association |
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Definition
| A relationship between two or more organisms of different species where one benefits and the other is neither harmed nor benefited. |
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Definition
| A relationship between two or more organisms of different species where one benefits and the other is harmed |
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Definition
| A body cavity within organisms containing specialized tissue |
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Definition
| Extensions of the body containing thin-walled blood vessels that allow for easy absorption of oxygen from the outside surface |
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