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

[EX Q]: Because action potentials are so brief, a neuron can produce hundreds per what?
[EX A]: second

[EX Q]: A plant is composed of two main types of tissue: meristematic tissue and what other kind of tissue?
[EX A]: permanent tissue

[EX Q]: The potential of what can be used to measure the ph of a solution?
[EX A]:
galvanic cell