Final answer:
The last common ancestor of monkeys and apes lived approximately 7 million years ago (MYA). Sahelanthropus tchadensis, a fossil ape, is believed to be the last common ancestor of humans and chimpanzees.
Step-by-step explanation:
The last common ancestor of monkeys and apes lived approximately 7 million years ago (MYA). Sahelanthropus tchadensis, a fossil ape, is believed to be the last common ancestor of humans and chimpanzees. Genetic studies suggest that humans and chimpanzees diverged from each other between 5 MYA and 7 MYA.