Section: Science

186) View Additional Information

The following creatures — frogs, salamanders, turtles, crocodiles, and snakes — proliferated during which described period:

1. Cretaceous
2. Mesozoic
3. Jurassic
4. None of the above.

Paragraph five is where we find out these creatures have proliferated. It is established in paragraph four that this is part of a series of developments taking place in the Cretaceous period.