What evidence suggests that comets played a role in supplying water to Earth?
Answer
Isotopic analysis comparing $ ext{HDO}$ to $ ext{H}_2 ext{O}$ ratios.
Scientists study the ratio of heavy water ($ ext{HDO}$) to normal water ($ ext{H}_2 ext{O}$) in comets and compare it to Earth's ocean water, suggesting comets delivered a significant fraction of that water.
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