Final answer:
The Eocene Epoch began approximately 54 MYA and ended about 34 MYA. It was a period of significant evolution and the appearance of the first true primates.
Step-by-step explanation:
The Eocene Epoch began approximately 54 MYA and ended about 34 MYA. During this time, the first true primates appeared, resembling present-day prosimians such as lemurs. The Eocene also marked the tremendous evolution of strepsirrhine primates, with four times as many species as there are today. Fossil primates from this epoch are common in North America, Europe, Asia, and Africa.