Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

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

Example Input: 10 million years long can a large star be on the main sequence stage.
Example Output: How long can a large star be on the main sequence stage?

Example Input: The term fitness describes the overall ability of an animal to survive and produce offspring.
Example Output:
What term describes the overall ability of an animal to survive and produce offspring?