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| phylum of radially symmetrical coelomate marine invertabrates |
| cold-blooded aquatic vertebrates with gills, often have fins and elongated body covered with scales |
) -elled, -el·ling.| model (mŏd'l) Pronunciation Key
A systematic description of an object or phenomenon that shares important characteristics with the object or phenomenon. Scientific models can be material, visual, mathematical, or computational and are often used in the construction of scientific theories. See also hypothesis, theory. |