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 Q]: Question: The atomic number defines the identity of what? Answer: element
[EX A]: The atomic number defines the identity of an element.

[EX Q]: Question: What part of the sweet potato store sugar from photosynthesis as starch? Answer: roots
[EX A]: Secondary growth of sweet potato roots provides more space to store food. Roots store sugar from photosynthesis as starch. What other starchy roots do people eat?.

[EX Q]: Question: The lithosphere-asthensophere divisions are based on what? Answer: mechanical properties
[EX A]:
The lithosphere-asthensophere divisions are based on mechanical properties.