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

[EX Q]: Passage: Landslides are the most dramatic, sudden, and dangerous types of mass wasting. Landslides are sudden falls of rock; by contrast, avalanches are sudden falls of snow. Answer: landslides
[EX A]: What are the most dramatic, sudden, and dangerous types of mass wasting?

[EX Q]: Passage: Chemical reactions constantly occur inside the cells of living things. However, under the conditions inside cells, most biochemical reactions would occur too slowly to maintain life. That's where enzymes come in. Enzymes are catalysts in living things. Like other catalysts, they speed up chemical reactions. Enzymes are proteins that are synthesized in the cells that need them, based on instructions encoded in the cells' DNA. Answer: enzymes
[EX A]: What proteins synthesized in cells act as catalysts?

[EX Q]: Passage: For the first 4 billion years of Earth history there is only a little evidence of life. Organisms were tiny and soft and did not fossilize well. But scientists use a variety of ways to figure out what this early life was like. Note that the period from Earth's origin to the beginning of the Phanerozoic is called the Precambrian. Answer: precambrian
[EX A]:
What is the period from earth's origin to the beginning of the phanerozoic eon?