Multiple choice

What is the longest living structure on Earth?

  1. the Great Barrier Reef

  2. the Amazon rain forest

  3. the Great Smoky Mountains National Park

  4. the Nile river
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Great Barrier Reef is a massive living structure composed of billions of tiny organisms called coral polyps, and it is visible from space, making it the largest living structure on Earth.

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