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

[EX Q]: Passage: Mouth Brooding. Some species of fish carry their fertilized eggs in their mouth until they hatch. This is called mouth brooding. If you look closely, you can see the eggs inside the mouth of the cardinalfish pictured here. Answer: mouth brooding
[EX A]: Some species of fish carry their fertilized eggs in their mouth until they hatch; this is called what?

[EX Q]: Passage: Secondary pollutants form from chemical reactions that occur when pollution is exposed to sunlight. Answer: sunlight
[EX A]: Secondary pollutants form from chemical reactions that occur when pollution is exposed to what?

[EX Q]: 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
[EX A]:
Different colors of light differ in terms of which important attribute?