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552

Q:

What is the main idea of the passage?

  • 1
    Jellyfish is an endangered species.
  • 2
    Low oxygen content due to water pollution has caused changes in aquatic ecosystem.
  • 3
    Informing some unknown facts about jellyfish.
  • 4
    Destruction caused by Hurricane Harvey.
  • 5
    How to improve ecological balance.
  • Show Answer
  • Workspace

Answer : 2. "Low oxygen content due to water pollution has caused changes in aquatic ecosystem."

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