Crossing over, or recombination, is the exchange of chromosome segments between nonsister chromatids in meiosis. Crossing over creates new combinations of genes in the gametes that are not found in either parent, contributing to genetic diversity.
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Answer: Stimulus is something that causes a reaction, either positive or negative in the body of an organism. Examples includes, HEAT, COLD, PRESSURE, PAIN
Explanation:
These reactions are METABOLISM.