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

Unlike ammonia, oxygen cannot be liquefied at room temperature because its critical temperature is below room temperature.
Unlike ammonia, oxygen cannot be liquefied at room temperature because its what is below room temperature?

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

The multifidus muscle of the lumbar region helps extend and laterally flex this?

The multifidus muscle of the lumbar region helps extend and laterally flex this?