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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.
the growth of cities due to the influx of people from rural areas.
small, non-pigmented plastids that occur in roots and non-photosynthetic tissues of plants. They...
in plants: the structure within a seed that will develop into the new plant.