How is the reaction described where energy is absorbed because of a chemical reaction?

Which would be an adaptation in a rainforest, but not in a tundra? a. ability to store water for a long time b. fur that blends in with snow c. strong claws for killing prey d. a beak that can dig into thick trees

Aperson with age is more likely to catch diseases that healthy people usually don’t catch.what are these infections called?

Can someone i have no idea of how to do this.