Given a statement, generate a question such that the answer is contained in that statement.

Example input: Neurons deliver electrical impulses to other cells
Example output: What do neurons deliver to other cells?
Example explanation: The question generated is valid regarding the information in the statement.
Q: A fish's skin allow fish to move through the water without slowing down too much
A:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
What allows fish to move through the water without slowing down too much?