TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: The brain is the most complex organ in the human body.

SOLUTION: What is the most complex organ in the human body?

PROBLEM: The male reproductive system consists of structures that produce sperm and secrete testosterone.

SOLUTION: What does the male reproductive system consist of?

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

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