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

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

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

Ex Input:
Mesoderm type of cell layer do flatworms have.

Ex Output:
What type of cell layer do flatworms have?

Ex Input:
Trans fat is manufactured and added to foods to preserve freshness.

Ex Output:
What is manufactured and added to foods to preserve freshness?