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

Input: Consider Input: Metabolism produces waste energy in the form of heat, which helps warm-blooded (endotherm) animals conserve and maintain heat at a relatively constant body temperature.

Output: Metabolism produces waste energy in the form of heat, which helps what type of animal conserve and maintain heat at a relatively constant body temperature?


Input: Consider Input: Instead of heat, organisms use catalysis to speed up reactions.

Output: Instead of heat, organisms use what to speed up reactions?


Input: Consider Input: 600 million many years ago may the earliest fungi have evolved.


Output: How many years ago may the earliest fungi have evolved?