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

Input: Consider Input: On a global scale, plants and other photosynthetic organisms have generated all of the oxygen in the air.

Output: On a global scale, plants and other photosynthetic organisms have generated all of what element in the air?


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

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


Input: Consider Input: Sex-linked traits are located on genes on sex chromosomes.


Output: Sex-linked traits are located on genes on what chromosomes?