300
Reptiles and mammals are different types of animals. A reptile is cold-blooded, which means that its body temperature is about the same as the outside temperature. Mammals are warm-blooded, so their body temperatures change very little.
According to the passage, what happens to the body temperature of a cold-blooded animal?
a. It gets colder when the air outside gets warmer.
b. It gets warmer when the air outside gets warmer.
c. It gets warmer when the air outside gets colder.
d. It does not change very much.
What is b. it gets warmer when the air outside gets warmer?