Sponges,Cnidarians, and Worms by Kory Chavez
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Created by:
martinez2nd on May 2, 2011
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22 terms
Terms | Definitions |
|---|---|
 cell | the basic structural and functional unit of all organisms |
| tissue | a part of an organism consisting of an aggregate of cells having a similar structure and function |
| organ | a collection of tissues that carry out a specialized function of the body |
| adaptation | the responsive adjustment of a sense organ (as the eye) to varying conditions (as of light) |
| sexual reproduction | reproduction involving the union or fusion of a male and a female gamete |
| fertilization | process in sexual reproduction in which male and female reproductive cells join to form a new cell |
| asexual reproduction | process by which a single parent reproduces by itself |
| phylum | the major taxonomic group of animals and plants |
| vertebrate | animals having a bony or cartilaginous skeleton with a segmented spinal column and a large brain enclosed in a skull or cranium |
| invertebrate | lacking a backbone or spinal column |
| larva | the immature free-living form of most invertebrates and amphibians and fish which at hatching from the egg is fundamentally unlike its parent and must metamorphose |
| cnidarian | radially symmetrical animals having saclike bodies with only one opening and tentacles with stinging structures |
| polyp | one of two forms that coelenterates take e.g. a hydra or coral: usually sedentary and has a hollow cylindrical body usually with a ring of tentacles around the mouth |
| medusa | one of two forms that coelenterates take: is the free-swimming sexual stage in the life cycle of a coelenterate and has a gelatinous umbrella-shaped body and tentacles |
| colony | a group of animals of the same type living together |
| coral reef | a reef consisting of coral consolidated into limestone |
| parasite | an animal or plant that lives in or on a host (another animal or plant) |
| host | an animal or plant that nourishes and supports a parasite |
| free-living organism | an organism that does not live in or on other organisms |
| scavenger | any animal that feeds on refuse and other decaying organic matter |
| anus | excretory opening at the end of the alimentary canal |
| closed circulatory system | system in which blood is contained within a network of blood vessels |
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