The answer is pili. the specific type of pili that can exchange genetic information is conjugative pili. when bacteria exchange geetc information, this process is called bacterial conjugation. conjugative pili can also be named as sex pili because they also allow exchange of genes
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Scientists use several methods to determine the proximity between species. Two of those methods may be an anatomical comparison, by examining the skeleton structure of two species, and DNA composition comparison, by comparison of genes, or specific parts of the DNA, that allow establishing the relative distance between species.