Evidence of the earliest life on earth has been found in fossils dating back about 3.5 billion years, in the Precambrian era.
The fossils are of microscopic plantlike single cells called blue-green algae, similar to bacteria today.
Life, as we know it, did not exist before there was water, so sometime between 4.2 billion years ago (when scientists estimate water began to form on Earth) and 3.5 billion years ago, life began.
See also:
- How Long Has There Been Life On Earth?
- Why Is the Cambrian Period Important In the Evolution of Life On Earth?
- How Did the Earth’s Atmosphere Form and When Did Oxygen First Form In the Earth’s Atmosphere?
- How Much of the Earth Is Covered With Water and How Many Different Marine Life Forms Live In the Ocean?
- How Did Life On Earth Begin?
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God is the reason for life on earth.