Why is the operational sex ratio (the relative numbers of males and females available to...

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Biology

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Why is the operational sex ratio (the relative numbers of males and females available to mate at any given time) often male-biased in natural populations?a. Because males mate more frequently than femalesb. Because the cost of breeding is higher for femalesc. Because a male-biased sex ratio increases the number of descendants at the next generationd. A and Be. A, B, and C

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