Given a scientific question and its correct answer, generate supporting facts for the answer. This supporting fact can be an explanation for the answer to the given question.

Ex Input:
Question: Lactic acid fermentation is common in muscle cells that have run out of what? Answer: oxygen

Ex Output:
Figure 7.14 Lactic acid fermentation is common in muscle cells that have run out of oxygen.

Ex Input:
Question: What type of waste is eliminated from the body through the anus? Answer: solid

Ex Output:
solid waste that remains after food is digested and is eliminated from the body through the anus.

Ex Input:
Question: As a polycrystalline material solidifies, grains with irregular shapes form. the interfaces between grains constitute grain what? Answer: boundaries

Ex Output:
Grain boundaries. As a polycrystalline material solidifies, grains with irregular shapes form. The interfaces between grains constitute grain boundaries. (Squares represent unit cells within grains.