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

Ex Input:
Most ferns produce the same type of spores and are therefore called homosporous.

Ex Output:
Most ferns produce the same type of spores and are therefore called what?


Ex Input:
Pangaea began breaking apart 250 million years ago.

Ex Output:
How many millions of years ago did pangaea begin breaking apart?


Ex Input:
You call cellular respiration that does not need oxygen to proceed anaerobic respiration.

Ex Output:

What do you call cellular respiration that does not need oxygen to proceed?