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

Landslides moving loose rocks downhill process is the best example of a sudden change to earth's surface.
Which process is the best example of a sudden change to Earth's surface?

In the lungs, oxygen diffuses out of the alveoli and into capillaries.
In the lungs, oxygen diffuses out of the alveoli and into where?

Respiratory and circulatory systems two systems primarily function to rid the human body of the wastes resulting from cellular energy production.
Which two systems primarily function to rid the human body of the wastes resulting from cellular energy production?