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

Ex Input:
Passage: Condensation reactions are the chemical processes by which large organic compounds are synthesized from their monomeric units. Hydrolysis reactions are the reverse process. During condensation reactions, water is produced from the two molecules being bonded together; an H from one monomer is joined to an -OH from another molecule, producing H 2 O. Answer: water

Ex Output:
What is produced during a condensation reaction?

Ex Input:
Passage: Whales and bats have the trait of echolocation. This is the ability to locate objects in the dark by bouncing sound waves off them. The most recent common ancestor of whales and bats did not have this trait. Apply lesson concepts to explain how the trait evolved in whales and bats. Answer: echolocation

Ex Output:
What term is defined as the ability to locate objects in the dark by bouncing sound waves off them.

Ex Input:
Passage: In the digestive system, food is digested and its nutrients are absorbed by the blood for transport around the body. The blood is part of the cardiovascular system. Answer: digestive

Ex Output:
Nutrients from food are absorbed by the blood for transport around the body as part of what system?