This is why Africa and South America have different species of monkeys. They evolved differently after these 2 continents split.

Google:

Between about 170 million and 180 million years ago, Gondwana began its own split, with Africa and South America breaking apart from the other half of Gondwana. About 140 million years ago, South America and Africa split, opening up the South Atlantic Ocean between them.

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Speciation is the evolutionary process by which populations evolve to become distinct species.