Given a scientific passage and an answer, generate a question for the given answer.

Input: Consider Input: Passage: Loudness refers to how loud or soft a sound seems to a listener. The loudness of sound is determined, in turn, by the intensity, or amount of energy, in sound waves. The unit of intensity is the decibel (dB). Answer: decibel

Output: What is the term used to measure the intensity of sound waves?

Input: Consider Input: Passage: Imagine walking in the forest in Figure below . The towering trees have been growing here for hundreds of years. It may seem as though the forest has been there forever. But no ecosystem is truly static. The numbers and types of species in most ecosystems change to some degree through time. This is called ecological succession. Important cases of ecological succession are primary succession and secondary succession. Answer: ecological succession

Output: The numbers and types of species in most ecosystems change to some degree through time and this is called?

Input: Consider Input: Passage: Diabetes is another type of noninfectious disease. Diabetes occurs when the pancreas doesn't make enough insulin or else the body's cells are resistant to the effects of insulin. Insulin is a hormone that helps cells absorb glucose from the blood. Answer: diabetes
Output: What occurs when the pancreas doesn't make enough insulin or else the body's cells are resistant to the effects of insulin?