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 does the male reproductive system consist of? Answer: structures that produce sperm and secrete testosterone
[A]: The male reproductive system consists of structures that produce sperm and secrete testosterone.

[Q]: Question: What kind of reaction is needed to prepare amides? Answer: carboxylic acid reaction
[A]: Amides are prepared by the reaction of a carboxylic acid with ammonia or an amine.

[Q]: Question: What term describes weathering that occurs as water expands when it freezes, wedging apart rock? Answer: mechanical weathering
[A]:
form of mechanical weathering that occurs as water expands when it freezes, wedging apart rock.