Metals and the Beginnings of Life

Long ago life began on Earth. One of the most intriguing questions is what caused it to start just then. A little less than 2 billion years ago, metals including copper, molybdenum and zinc became available to primitive cells, at the same time that the cells began to become much more complex. Some scientists indicate that they have identified the event that introduced these metals, which made it possible for those primitive cells to develop, evolve, and spread.

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