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

[EX Q]: Hormones, ions, and neurotransmitters are all types of what?
[EX A]: chemical signals

[EX Q]: Why does the fish odour diminish when you put lemon juice over cooked fish?
[EX A]: due to neutralization

[EX Q]: A convergent plate boundary is created when two plates do what?
[EX A]:
come toward each other