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

Respiratory acidosis is considered to be problematic because excess co2 in blood.
Why is respiratory acidosis considered to be problematic?

Microevolution is the process by which organisms change in small ways over time.
What is the process by which organisms change in small ways over time?

Pivot joint is the name of a joint in which one bone rotates in relation to another bone.
What is the name of a joint in which one bone rotates in relation to another bone?