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Definition
| multicelled heterotrophs that move about during part or all of the life cycle |
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Term
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Definition
| body parts are repeated around a central axis |
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Definition
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Definition
| nerve cells have become concentrated at the head end |
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Definition
| digestive sac or tube that opens at the body surface |
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Term
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Definition
| cavity lining of tissue derived from mesoderm |
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Definition
| cavity incompletely lined by mesodermal tissue |
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Term
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Definition
| first opening that appears on the embryo becomes the mouth and the second becomes the anus |
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Term
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Definition
| first opening develops into the anus and the second becomes the mouth |
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Definition
| the modern protest most closely related to animals |
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Definition
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Definition
| aquatic animals with no symmetry, tissues, or organs |
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Definition
| individual that produces both eggs and sperm |
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Definition
| free-living, sexually immature stage in an animal life cycle |
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Definition
| include 10,000 species of radially symmetrical animals such as corals, sea anemones, and jellyfishes |
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Definition
| help capture prey and also function as a defense |
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Definition
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Definition
| fluid-filled cavity or cellular mass that contractile cells exert force on |
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Definition
| form a three-layered embryo and have organ systems |
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Definition
| connects the mouth with the gut |
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Definition
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Definition
| bilateral worms with a coelon and a body that is segmented, inside and out |
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Term
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Definition
| collects coelomic fluid, adjusts its composition, then expels waste through a pore in the next segment |
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Term
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Definition
| bilaterally symmetrical invertebrates with a reduced coelom |
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Term
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Definition
| skirtlike extension of the upper body wall that covers a mantle cavity |
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Term
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Definition
| aquatic mollusks typically have one or more respiratory organs |
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Term
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Definition
| tonguelike organ hardened with chitin |
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Definition
| cling to rocks and scrape up algae |
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Term
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Definition
| include many of the mollusks that end up on our dinner plates, including mussels, oysters, clams, and scallops |
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Term
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Definition
| aquatic and include the squids, octopuses, and relatives |
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Definition
| live in freshwater and in damp land habitats. |
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Definition
| similarly tiny animals that often live beside rotifers in damp moss and temporary ponds |
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Term
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Definition
| bilateral, unsegmented worms with a cuticle-covered cylindrical body |
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Definition
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Definition
| tissues get remodeled as juveniles become adults |
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Definition
| mostly marine arthropods that have two pairs of antennae |
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Term
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Definition
| land-dwelling arthropods with two antennae and an abundance of body segments |
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Term
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Definition
| interlocking spines and plates of calcium carbonate embedded in their skin |
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