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

Poles parts of the planet does solar energy have difficulty reaching.
What parts of the planet does solar energy have difficulty reaching?

Pheromones enable communication, which is vital for organisms like ants that live in a large community.
Pheromones enable what, which is vital for organisms like ants that live in a large community?

Carbon (c) is essential to living organisms because carbon bonds in many ways with itself to form chains.

What characteristic of carbon (C) makes it essential to living organisms?