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Definition
| Animals that lack a backbone |
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Definition
| Animals that possess a backbone |
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Term
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Definition
| An organism possesses spherical symmetry if it can be cut into two identical halves by any cut that runs through the organism's center |
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Definition
| An organism possesses radial symmetry if it can be cut into two identical halves by any longitudinal cut through its center |
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Definition
| An organism possesses bilateral symmetry if it can only be cut into two identical halves by a single longitudinal cut along its center which divides it into right and left halves |
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Term
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Definition
| An outer layer of cells designed to provide protection |
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Definition
| The jellylike substance that separates the epidermis from the inner cells in a sponge |
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Definition
| Flagellated cells that push water through a sponge |
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Definition
| Cells that move using pseudopods and perform different functions in different animals |
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Definition
| A cluster of cells encased in a hard, spicule-reinforced shell |
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Definition
| The sessile, tubular form of a cnidarian with a mouth and tentacles at one end and a basal disk at the other |
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Definition
| A free-swimming cnidarian with a bell-shaped body and tentacles |
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Term
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Definition
| Animal tissue consisting of one or more layers of cells that have only one free surface, because the other surface adheres to a membrane or other substance |
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Definition
| The jellylike substance that separates the epithelial cells in a cnidarian |
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Definition
| Small capsules that contain a toxin which is injected into prey or predators |
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Definition
| Organs that produce sperm |
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Definition
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Definition
| The end of an animal that contains its head |
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Definition
| The end of an animal that contains its tail |
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Definition
| A system designed to transport food and other necessary substance throughout a creature's body |
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Definition
| A system of sensitive cells that respond to stimuli such as sound, touch, and taste |
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Term
| Ganglia (singular: ganglion) |
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Definition
| Masses of nerve cell bodies |
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Definition
| Possessing both the male and the female reproductive organs |
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Definition
| The ability to regrow a missing part of the body |
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Term
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Definition
| A sheath of tissue that encloses the vital organs of a mollusk, makes the mollusk's shell, and performs respiration |
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Definition
| A tough, multilayered structure secreted by the mantle, generally used for protection, but sometimes for body support |
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Definition
| A hump that contains a mollusk's heart, digestive, and excretory organs |
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Term
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Definition
| A muscular organ that is used for locomotion and takes a variety of forms depending on the animal |
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Term
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Definition
| An organ covered with teeth that mollusks use to scrape food into their mouths |
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Definition
| An organism with a single shell |
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Definition
| An organism with two shells |
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