Question

Origin of first mammals occurred

• A. 500 million yrs
• B. 220 million yrs
• C. 1600 million yrs
• D. Over 1600 million yrs ago

Answer 1

The correct option is B 220 million yrs

Warm-blooded animals showed up on the earth well before the termination of the dinosaurs; indeed, dinosaurs and vertebrates began inside 10 million years of one another, in the late Triassic around 200 million years prior.

So, the correct option is '220 million yrs'.