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

[EX Q]: Passage: Cutting down on the use of chemical fertilizers is one way to prevent dead zones in bodies of water. Preserving wetlands is also important. Wetlands are habitats such as swamps, marshes, and bogs where the ground is soggy or covered with water much of the year. Wetlands slow down and filter runoff before it reaches bodies of water. Wetlands also provide breeding grounds for many different species of organisms. Answer: dead zones
[EX A]: Cutting down on the use of chemical fertilizers and preserving wetlands are ways to prevent what "unlivable" regions in bodies of water?

[EX Q]: Passage: An ionic bond is the force of attraction that holds together oppositely charged ions. Ionic bonds form crystals instead of molecules. Table salt contains ionic bonds. Answer: ionic bond
[EX A]: What term means the force of attraction that holds together oppositely charged ions?

[EX Q]: Passage: New mitochondria and chloroplasts are produced through a process similar to binary fission. Bacteria also reproduce through binary fission. Answer: binary fission
[EX A]:
How do bacteria reproduce?