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

Ex Input:
Passage: Saturated fatty acids have only single bonds between carbon atoms. As a result, the carbon atoms are bonded to as many hydrogen atoms as possible. In other words, the carbon atoms are saturated with hydrogens. Saturated fatty acids are found in fats. Answer: saturated

Ex Output:
Carbon atoms are bonded to as many hydrogen atoms as possible in what type of fatty acids?

Ex Input:
Passage: The cell membrane is made up of a phospholipid bilayer, two layers of phospholipid molecules. Notice the polar head group of the phospholipid is attached to the phosphate, and the tails are two fatty acid chains. The head group and tails are attached by a glycerol backbone. Answer: cell membrane

Ex Output:
What basic cell structure is made up of a phospholipid bilayer and two layers of phospholipid molecules?

Ex Input:
Passage: A: The paper is being cut into smaller pieces, which is changing its size and shape. The ice cubes are turning into a puddle of liquid water because they are melting. This is a change of state. The tablet is disappearing in the glass of water because it is dissolving into particles that are too small to see. The lighthouse is becoming coated with ice as ocean spray freezes on its surface. This is another change of state. Answer: state

Ex Output:
Melting ice cubes and freezing water are examples of change of what?