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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.
diet which contains all the nutrients needed by the body in the correct quantities and...
organisms that are unable to produce their own organic food and must therefore obtain nutrients...
biological classification group (taxon) for animals that is divided into classes. The plural of...
competition between organisms of different species.