Answer :
All primates are descended from creatures that lived in trees, they all possess characteristics that make them capable of climbing trees, such as a rotating shoulder joint, separated large toes and thumbs for grabbing, and stereoscopic vision.
Geneticists have proposed over the past 45 years that the ancestors of modern humans and chimpanzees parted between 4 and 6 million years ago, and the ancestors of gorillas between 7 and 9 million years ago. However, since chimpanzee and gorilla fossils are scarce, these dates were determined by measuring the number of DNA sequence variations between the three species and dividing that number by an assumed "mutation rate" for primates, or the rate at which mutations appear through time. The issue is that scientists frequently use dates from fossils of other monkey species to compute the mutation rate before applying this rate to African apes and humans.
Hence, divergence evolution creates organ performing different function.
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