California Basic Educational Skills Test (CBEST)

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A student reads the following passage: "The coral reef ecosystem supports thousands of marine species. Corals provide shelter; fish provide food for larger predators; algae produce oxygen underwater." What is the MAIN IDEA of this passage?

Coral reefs are beautiful structures found in tropical oceans The coral reef ecosystem is interconnected, with each organism playing a role Algae are the most important organisms in a coral reef Fish predators depend on coral reefs for their survival

Correct Answer:

The coral reef ecosystem is interconnected, with each organism playing a role

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