instruction:
Given a scientific question, generate a correct answer to it.
question:
What causes continents to drift closer to the poles or the equator?
answer:
plate movements

question:
Slow-twitch or fast-twitch and oxidative or glycolytic describe what type of fibers?
answer:
skeletal muscle fibers

question:
The smallest part of an element that maintains the identity of that element is called what?
answer:
atom