Both A and R are true, and R is the correct explanation of A. Sexual reproduction introduces genetic variations, increasing adaptability to environmental changes. These variations give better chances of survival compared to asexual reproduction. Hence, both assertion and reason are true, and reason correctly explains the assertion.
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In sexual reproduction, offspring inherit genes from both parents, creating unique combinations. This increases genetic diversity and chances of adaptability to changing environments. Variations often provide survival benefits, making sexual reproduction more favorable than asexual reproduction. Thus, both assertion and reason are true, and the reason correctly explains the assertion. The correct option is A.