Choices: a). Decibels. b). find habitat. c). mate. d). exercise. e). health. f). grow. g). survive. h). sound.

Fact 1: Playing is just one of many ways that mammals and other animals learn how to behave. Fact 2: Learning and memory are essential to an animal's ability to survive and thrive. Given the two facts above, playing is one of many ways animal improve ability to what?
Answer:
g).