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

[EX Q]: What states that chemical reactions occur when atoms, ions, or molecules collide?
[EX A]: collision theory

[EX Q]: Duplicated chromosomes are composed of two sister what?
[EX A]: chromatids

[EX Q]: What rate is generally higher for endotherms than for ectotherms?
[EX A]:
metabolic