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

[EX Q]: Antifreeze lowers it the freezing temperature of the water in car radiators.
[EX A]: What does antifreeze do to the freezing temperature of the water in car radiators?

[EX Q]: Lichens are not a single organism, but rather an example of a mutualism.
[EX A]: Lichens are not a single organism, but rather an example of a what?

[EX Q]: The first living cells may have evolved around 4 billion years ago.
[EX A]:
The first living cells may have evolved around how long ago?