What source of energy caused the evolution of life?

Biologists are not in complete agreement about exactly where life on Earth first appeared. It could have evolved on the ocean floor, in shallow rock pools, or from building blocks delivered by asteroid impacts — or perhaps all of the above. We know that all life in Earth it needs water to survive, so life likely evolved there. But water alone is not enough to awaken life; it also needs energy.

Today, most living things get their energy from metabolizing sugars, but these molecules did not exist 3.7 billion years ago, when life evolved.

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