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.

Question: Frequency and intensity are two measurable properties of what? Answer: wave
All waves can be defined in terms of their frequency and intensity.

Question: Differences in fitness among different members of a population can lead to what kind of selection? Answer: natural selection
Natural selection occurs when there are differences in fitness among members of a population.

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