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

Ex Input:
The endocrine system produces hormones to regulate growth, development, and reproduction.

Ex Output:
Which human organ system produces hormones to regulate growth, development, and reproduction?

Ex Input:
Covalent solutes separate into individual molecules when dissolved.

Ex Output:
Covalent solutes separate into what when dissolved?

Ex Input:
Individuals do populations gain through births and immigration.

Ex Output:
What do populations gain through births and immigration?