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1) having hair makes us mammals; hair is a synapomorphy that is unique to all mammals and is present in other mammals that evolved before humans, like the platypus and cats
2) no, monkeys are more related to humans because they have more shared derived traits. Cats and monkeys only share the traits up to the ancestor of eutharians, while monkeys and humans are primates and share those additional traits.
3) the node on the tree indicates that humans and monkeys descended from a common ancestor; humans did NOT descend from monkeys or the node would be labeled as monkeys or something. instead, monkeys and humans branch off from a node representing a common ancestor
How long ago did humans split from the common ancestor that gave rise to the two living species of chimpanzees?
7 million years ago
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