Assertion: coral reef | /r/CapableOf | evolve on earth
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Source sentences:
text: Coral reefs have evolved on earth over the past 200 to 300 million years, and have developed a unique and highly evolved form of symbiosis.
text: As we currently know them, coral reefs have evolved on earth over the past 200 to 300 million years, and over this evolutionary history, perhaps the most unique feature of corals is the highly evolved form of symbiosis.