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

Input: Consider Input: Sexual reproduction, in general, relies on sets of cells that are precursors for eggs and sperm.

Output: What kind of reproduction, in general, relies on sets of cells that are precursors for eggs and sperm?


Input: Consider Input: During the early paleozoic, the amount of carbon dioxide in the atmosphere was much greater compared to today.

Output: During the early paleozoic, the amount of carbon dioxide in the atmosphere compared to today was?


Input: Consider Input: Portal veins carry blood between pairs of capillary beds.
Output: Portal veins carry blood between what?