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

Input: Consider Input: All enzymes have an optimal temperature and ph.

Output: All enzymes have an optimal temperature and what?


Input: Consider Input: Phospholipids are the main component of the cell membrane.

Output: What is the main makeup of the cell membrane?


Input: Consider Input: Dentists occasionally use metallic mixtures called amalgams for fillings.


Output: Dentists occasionally use metallic mixtures called amalgams for what?