What energy source triggered the evolution of life?

Biologists are not entirely in agreement on exactly where the first life on Earth appeared. It may have evolved on the ocean floor, in shallow rock basins, or from building blocks delivered by asteroid impacts – or perhaps all of the above. We know that all life on Earth needs water to survive, so life probably developed there first. But water alone is not enough to trigger life; it also needs energy.

Today, most living beings draw their energy from metabolize sugars, but these molecules did not exist 3.7 billion years ago when life began to evolve.

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