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.

[Q]: Question: What occurs at joints? Answer: body movements
[A]: Movements of the body occur at joints. Describe how muscles are arranged around the joints of the body.

[Q]: Question: What composition determines both eruption type and volcano type? Answer: magma
[A]: Magma composition determines both eruption type and volcano type.

[Q]: Question: Living organisms are comprised of organic compounds, which are molecules built around what element? Answer: carbon
[A]:
Living organisms are comprised of organic compounds, molecules built around the element carbon.