Cotton-topped tamarins are small primates with tufts of long white hair on their heads.While studying these creatures,you notice that males with longer hair get more opportunities to mate and father more offspring.To test the hypothesis that having longer hair is adaptive in these males,you should

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To test the hypothesis that longer hair is adaptive in male cotton-topped tamarins, the researcher needs to determine whether hair length is heritable, which can be done by observing whether the offspring of longer-haired males also have longer hair. This would confirm whether hair length is a genetic trait that contributes to reproductive success. The other options listed may provide interesting information, but they would not directly test the hypothesis in question.

Cotton-Topped Tamarins Are Small Primates with Tufts of Long White