Question

What occurred during the Cretaceous period of animal evolution?

• A. Dinosaurs evolved
• B. Extinction of dinosaurs
• C. Evolution of primitive birds
• D. Modern birds disappeared

Answer 1

Answer:

B. Extinction of dinosaurs

• Extinction of dinosaurs and primitive birds occurred.

• First modern birds appeared during the Cretaceous period. Also, primitive placental mammals like insectivorous shrews also originated.

• This all occurred 7.1 crore years ago.