Given a scientific question, generate a correct answer to it.

[EX Q]: What two types of communication do both humans and birds use primarily?
[EX A]: visual and auditory

[EX Q]: What is the first direct action of growth hormone?
[EX A]: stimulation of triglyceride breakdown

[EX Q]: The once compressed universe expanded rapidly after what nicknamed event billions of years ago?
[EX A]:
big bang