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: Most ecosystems are disturbed too often to attain what final, stable status? Answer: climax community
[EX A]: Most ecosystems are disturbed too often to attain a final, stable climax community.

[EX Q]: Question: Instead of wood, what do some fireplaces use? Answer: propane
[EX A]: Some fireplaces use propane gas rather than wood as fuel.

[EX Q]: Question: What is the decayed remains of living organisms called? Answer: humus
[EX A]:
Humus is the decayed remains of living organisms. Humus makes soil fertile.