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

Ex Input:
Passage: Wavelength is one way of measuring the size of waves. It is the distance between two corresponding points on adjacent waves, and it is usually measured in meters. How it is measured is a little different for transverse and longitudinal waves. Answer: waves

Ex Output:
What do wavelengths measure the size of?

Ex Input:
Passage: Monarch butterflies gather in large groups as they migrate 2,500 miles south each fall. They return to the north in the spring. This migration is a cycle that repeats every year. Answer: migration

Ex Output:
What do we call the seasonal movement of animals?

Ex Input:
Passage: There are 20 common amino acids in proteins. There are 64 possible codons, more than enough to code for the 20 amino acids. The genetic code is shown in Figure below . To see how scientists cracked the genetic code, go to this link: http://www. dnalc. org/view/16494-Animation-22-DNA-words-are-three-letters-long-. html . Answer: amino acids

Ex Output:
Proteins include 20 common types of what compounds?