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

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

An excellent solvent that holds heat well and allows hydrogen bonds, water substance has many properties critical to life.
An excellent solvent that holds heat well and allows hydrogen bonds, what substance has many properties critical to life?

Air pressure it decreases as altitude increases.
How does air pressure change as altitude increases?