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

[EX Q]: Pheromones enable communication, which is vital for organisms like ants that live in a large community.
[EX A]: Pheromones enable what, which is vital for organisms like ants that live in a large community?

[EX Q]: Sodium-potassium pumps help nerve cells establish a voltage across their plasma membranes.
[EX A]: Sodium-potassium pumps help nerve cells establish a voltage across their what?

[EX Q]: A forest is cleared to make space to plant wheat statement is an example of how humans have changed the natural environment.
[EX A]:
Which statement is an example of how humans have changed the natural environment?