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

Q: What does hair get its color from?

A: melanin pigments
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Q: Overpopulation takes place when the number of organisms in an area exceeds what?

A: carrying capacity
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Q: In machines that increase force, such as ramps and doorknobs and nutcrackers, what is the relation between output and input force?

A:
output is greater
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