TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: Pangaea began breaking apart 250 million years ago.

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

PROBLEM: Herbivores is the term for animals that eat producers to get energy.

SOLUTION: What is the term for animals that eat producers to get energy?

PROBLEM: The first living cells may have evolved around 4 billion years ago.

SOLUTION:
The first living cells may have evolved around how long ago?