instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
Photoautotrophs and chemoautotrophs are two basic types of autotrophs.
answer:
Photoautotrophs and chemoautotrophs are two basic types of what?

question:
You call egg-shaped galaxies, which are reddish to yellowish in color because they contain mostly old stars, elliptical galaxies.
answer:
What do you call egg-shaped galaxies, which are reddish to yellowish in color because they contain mostly old stars?

question:
Removed happens to energy when work is done by a system.
answer:
What happens to energy when work is done by a system?