00:10
00:09
00:08
00:07
00:06
00:05
00:04
00:03
00:02
00:01
| cold-blooded aquatic vertebrates with gills, often have fins and elongated body covered with scales |
| phylum of radially symmetrical coelomate marine invertabrates |
| planarian (plə-nâr'ē-ən) Pronunciation Key
Any of various small, chiefly freshwater flatworms of the class Turbellaria, having soft, broad, ciliated bodies shaped like a leaf. Planarians have a mouth on their lower side that is often closer to the tail than the head, and a three-branched digestive cavity. If a planarian is cut into several pieces, each piece can grow into a whole new organism. |