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

Input: Consider Input: Unlike ammonia, oxygen cannot be liquefied at room temperature because its critical temperature is below room temperature.

Output: Unlike ammonia, oxygen cannot be liquefied at room temperature because its what is below room temperature?


Input: Consider Input: When light passes from one medium to another, it changes speed.

Output: When light passes from one medium to another, it changes what?


Input: Consider Input: Blood helps maintain homeostasis by stabilizing ph, temperature, osmotic pressure, and by eliminating this?
Output: Blood helps maintain homeostasis by stabilizing ph, temperature, osmotic pressure, and by eliminating this?