Why did the Great Barrier Reef in Australia grow upward, forming the largest organic structure on Earth?

Name: Why did the Great Barrier Reef in Australia grow upward, forming the largest organic structure on Earth?
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The Great Barrier Reef grew upward in response to rising sea levels. Coral polyps, the organisms responsible for building reefs, need sunlight to survive. As sea levels rose, the corals grew upwards towards the light, creating the massive structure we see today.

Why Did the Great Barrier Reef in Australia Grow Upward