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

Input: Consider Input: Passage: Nobody really has such colorful eyes! The colors were added digitally after the photo was taken. They represent all the different colors of light. Light is a form of energy that travels in waves. Light of different colors has different wavelengths. Answer: wavelengths

Output: Different colors of light differ in terms of which important attribute?

Input: Consider Input: Passage: Optical telescopes are designed to collect visible light. The two types of optical telescopes are reflecting telescopes and refracting telescopes. Answer: reflecting and refracting

Output: What are the two types of optical telescopes?

Input: Consider Input: Passage: Enzymes are involved in most of the chemical reactions that take place in organisms. Answer: enzymes
Output: What substances, which serve as catalysts, are involved in most of the chemical reactions that take place in organisms?