easy · SAT Reading & Writing

Coral reefs cover less than 1% of the ocean floor but support roughly a quarter of all marine species. Rising ocean temperatures, however, have caused widespread coral bleaching in recent decades.

Which choice best describes the relationship presented in the text?

  1. Coral reefs cover most of the ocean floor and are unaffected by temperature.
  2. Marine species are declining rapidly because reefs cover far too much of the entire ocean floor surface.
  3. Ocean temperatures have been falling in recent decades.
  4. Reefs support far more species than their tiny size suggests, yet warming water threatens them.

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