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

All life is built around the element carbon.
What element is all life built around?

Most hormones are produced by the endocrine system.
Most hormones are produced by which human organ system?

During inhalation phase of breathing does the pressure inside the lungs drops to below atmospheric pressure.

During what phase of breathing does the pressure inside the lungs drops to below atmospheric pressure?