Read the passage: "Mangrove forests grow where rivers meet the sea. Their tangled roots trap mud and slow down waves, which protects coastal villages during cyclones. They also serve as nurseries for many kinds of fish." In the passage, "nurseries" means places where:
Correct answer: D. young fish grow safely
Here "nurseries" is used figuratively: the shallow, sheltered water among the roots is where young fish grow before moving out to sea.
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