Answer: One key distinguishing characteristic of primates is the presence ofopposable thumbs.Explanation:Primatesare a group of mammals that includes humans, apes, monkeys, and prosimians. They have several unique characteristics that distinguish them from other animals, but one of the most important is the presence of opposable thumbs. This means that their thumbs can move independently of their other fingers, allowing them to grasp and manipulate objects with great dexterity.Opposable thumbs are especially important for primates because they are arboreal, meaning that they live in trees. Being able to grasp branches and other objects with their hands allows them to move through the trees more easily and to forage for food. In addition, opposable thumbs are important for social interactions, such asgrooming, which is a common behavior among primates.Overall, the presence ofopposable thumbsis one of the defining characteristics of primates, and it has played a key role in their evolution and success as a group of animals.Know more about theopposable thumbsclick here:brainly.com/question/28033365#SPJ11...

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