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a single cell resulting from the fusion of two gametes.
variation due to the small differences in the genes that control each feature and characteristic...
this muscle 'closes' or bends the joint when it contracts (so the angle between the bones...
the breaking down of large, complex food particles into smaller, soluble molecules which can be...
(also called physical digestion) the breaking down of food into smaller pieces using mechanical...
drugs that are used to treat infections caused by bacteria. Many antibiotics are produced by...