What enables natural selection to occur?\nOptions:\n- (A) environment\n- (B) mutations\n- (C) competition\n- (D) relocation\n- (E) Darwin\n- (F) evolutionary development\n- (G) root growth\n- (H) research Let's solve this problem gradually.

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Mutations are essential for evolution to occur. Natural selection is the mechanism of evolution. Mutations allow for natural selection to occur. So the final answer is (B).
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