instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
The best way humans can conserve water is to use less.
answer:
What's the best way humans can conserve water?


question:
Transpiration is when plant roots absorb liquid water and release water vapor into the atmosphere.
answer:
What is it called when plant roots absorb liquid water and release water vapor into the atmosphere?


question:
10 million years long can a large star be on the main sequence stage.
answer:

How long can a large star be on the main sequence stage?