instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
In the lungs, oxygen diffuses out of the alveoli and into capillaries.
answer:
In the lungs, oxygen diffuses out of the alveoli and into where?


question:
Incubation is when birds keep their eggs warm while the embryos inside develop.
answer:
What is it called when birds keep their eggs warm while the embryos inside develop?


question:
Topsoil layer of soil, essential for farming, has the highest proportion of organic material.
answer:
What layer of soil, essential for farming, has the highest proportion of organic material?