Answer the following question given this paragraph: 

Mammals have the ability to regulate body temperature. This is an advantage, as Earth’s climate went through sudden and dramatic changes. Mastodons, saber tooth tigers, hoofed mammals, whales, primates and eventually humans all lived during the Cenozoic Era ( Figure below ).


Q: The ability to regulate what, which is possessed by mammals, was an advantage as earth’s climate went through sudden and dramatic changes?

 Choices:

- mutations

- reflex behaviors

- hair growth

- body temperature

A:
body temperature
