What source of energy triggered the evolution of life?

Biologists don’t quite agree on exactly where life first arose on Earth. It could have evolved at the bottom of the ocean, in shallow rock pools, or from building blocks delivered by asteroid impacts — or maybe all of them. We’ve known that for life Earth needs water to survive, so life probably evolved there first. But water alone is not enough to fuel life; it also needs energy.

Today most living things get their energy from metabolize Sugars, but these molecules didn’t exist 3.7 billion years ago when life first evolved.

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