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

[EX Q]: What is the term for a symbiotic relationship in which one species benefits while the other species is not affected?
[EX A]: commensalism

[EX Q]: What is the type of energy that involves movement?
[EX A]: mechanical energy

[EX Q]: What do scientists use to help explain objects or systems in simpler ways?
[EX A]:
models