Scientists estimate that the Earth formed some 4.6 billion years ago with the first forms of life appearing around 3.5 billion years ago. These first forms of life were simple prokaryotes. Later, the first photosynethic organisms resulted in more in the atmosphere. This allowed for more higher level organisms to appear on Earth. A) carbon B) nitrogen C) oxygen D) sulfur

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Prego

Chemistry

13 September, 09:36

Scientists estimate that the Earth formed some 4.6 billion years ago with the first forms of life appearing around 3.5 billion years ago. These first forms of life were simple prokaryotes. Later, the first photosynethic organisms resulted in more in the atmosphere. This allowed for more higher level organisms to appear on Earth. A) carbon B) nitrogen C) oxygen D) sulfur

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Melvin Pitts · Answer 1

Clouds formed as the Earth began to cool, producing enormous volumes of rainwater that formed the oceans. For the next 1.3 billion years (3.8 to 2.5 billion years ago), the Archean Period, first life began to appear and the world's landmasses began to form. Earth's initial life forms were bacteria, which could