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

[EX Q]: What can all living things sense and respond to in their environment?
[EX A]: stimuli

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

[EX Q]: What kind of movement do planets in the solar system make around the sun?
[EX A]:
elliptical orbits