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?

40 m/s north of the following represents the velocity of a moving object.
Which of the following represents the velocity of a moving object?

The capsule is the layer outside the cell wall in a prokaryote.

What is the layer outside the cell wall in a prokaryote?