instruction:
Given a scientific passage and an answer, generate a question for the given answer.
question:
Passage: Test wells are drilled to monitor groundwater pollution. Answer: test wells
answer:
What are drilled to monitor groundwater pollution?

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Passage: 30.1 | The Plant Body By the end of this section, you will be able to: Describe the shoot organ system and the root organ system Distinguish between meristematic tissue and permanent tissue Identify and describe the three regions where plant growth occurs Summarize the roles of dermal tissue, vascular tissue, and ground tissue Compare simple plant tissue with complex plant tissue Like animals, plants contain cells with organelles in which specific metabolic activities take place. Unlike animals, however, plants use energy from sunlight to form sugars during photosynthesis. In addition, plant cells have cell walls, plastids, and a large central vacuole: structures that are not found in animal cells. Each of these cellular structures plays a specific role in plant structure and function. Answer: animal cells
answer:
Cell walls, plastids, and a large central vacuole distinguish plant cells from what?

question:
Passage: Another major step in animal evolution was the evolution of a notochord. A notochord is a rigid rod that runs the length of the body. It supports the body and gives it shape (see Figure below ). It also provides a place for muscles to anchor, and counterbalances them when they contract. Animals with a notochord are called chordates. They also have a hollow nerve cord that runs along the top of the body. Gill slits and a tail are two other chordate features. Many modern chordates have some of these structures only as embryos. Answer: notochord
answer:
A major step in animal evolution was the evolution of what rigid rod that runs the length of the body?