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variation due to the small differences in the genes that control each feature and characteristic of an individual organism within a species.
a prolonged period of low rainfall which has a negative effect on plant, animal and human life...
the outermost nucleated cytoplasmic layer of the Schwann cells that surrounds the axon of a...
hollow tubular vascular tissue cells, strengthened with lignin that conducts water and mineral...
the structural and functional unit of the kidney, which filters the blood and produces urine....