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an informal term for any living species which appears to be the same as a species otherwise only known from fossils and which has no close living relatives. These species have all survived major extinction events. The coelacanth is an example of a living fossil.
strengthened, elongated xylem cells that conduct water.
the main vein that returns deoxygenated blood from the lower parts of the body to the right...
those species that are found only in a particular area or region and nowhere else on Earth.
the right and left halves of bilaterally symmetrical organisms are mirror images of each other...