Q: You are presented with the quiz "Lipid stores are used by plants and animals for what?"   But you don't know the answer, so you turn to your teacher to ask for hints. He says that "organisms use lipids to store energy" and "plants and animals are organisms".   So, what's the best answer to the question?

A: energy


Q: You are presented with the quiz "Magnetism can cause objects to do what to each other?"   But you don't know the answer, so you turn to your teacher to ask for hints. He says that "magnetism can cause objects to repel each other" and "if two things have the same charge, they repel, or push away from each other".   So, what's the best answer to the question?

A: push away


Q: You are presented with the quiz "germs that cause people to get sick cannot reproduce by what?"   But you don't know the answer, so you turn to your teacher to ask for hints. He says that "viruses cannot reproduce by themselves" and "viruses are germs that cause people to get sick".   So, what's the best answer to the question?

A: themselves


Q: You are presented with the quiz "What do animals do when the available nutrients in an environment decrease?"   But you don't know the answer, so you turn to your teacher to ask for hints. He says that "if the amount of available food and water decreases in an environment then animals may leave that environment to find food and water" and "food and water provided to patients by mouth is the usual means of providing nutrition to patients".   So, what's the best answer to the question?

A:
they leave to find them