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group of similar organisms that can breed with each other to produce fertile offspring. It is the lowest level (taxon) in the classification system.
cone-shaped mammalian teeth used to grip and tear off pieces of meat.
the formation of a relatively complex chemical compound from simpler substances.
the deposition or build-up of silt and organic matter on the beds of rivers, dams etc.
plant-like organisms that live and grow in water; they make their own organic food by the...