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

Input: Consider Input: Passage: The cardiovascular system moves nutrients and other substances throughout the body. Answer: cardiovascular system

Output: Which human body system system moves nutrients and other substances throughout the body?

Input: Consider Input: Passage: 4.2 Prokaryotic Cells Prokaryotes are predominantly single-celled organisms of the domains Bacteria and Archaea. All prokaryotes have plasma membranes, cytoplasm, ribosomes, and DNA that is not membrane-bound. Most have peptidoglycan cell walls and many have polysaccharide capsules. Prokaryotic cells range in diameter from 0.1 to 5.0 m. As a cell increases in size, its surface area-to-volume ratio decreases. If the cell grows too large, the plasma membrane will not have sufficient surface area to support the rate of diffusion required for the increased volume. Answer: decreases

Output: As the prokaryotic cell size increases, what happens to its surface area-to-volume ratio?

Input: Consider Input: Passage: When magma heats groundwater, it may come to the surface as a hot spring or a geyser. Answer: geyser
Output: When magma heats groundwater, it may come to the surface as a hot spring or a what?