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The first fossils were a type of blue-green algae that could photosynthesize.Earth's atmosphere was first supplied by the gasses expelled from the massive volcanic eruptions of the Hadean Era.This period of Earth’s formation is referred to as the pre-Cambrian Period.The pre-Cambrian is divided into three parts: the Hadean, Archean and Proterozoic Periods.There are many theories, but most have the same general perspective of how things came to be the way they are.Following is an account of life’s beginnings based on some of the leading research and theories related to the subject, and of course, fossil records dating back as far as 3.5 billion years ago.Earth’s initial life forms were bacteria, which could survive in the highly toxic atmosphere that existed during this time.Toward the end of the Archean Period and at the beginning of the Proterozoic Period, about 2.5 billion years ago, oxygen-forming photosynthesis began to occur.
These objects were the building blocks for the planets that exist today. By 3.8 to 4.1 billion years ago, Earth had become a planet with an atmosphere (not like our atmosphere today) and an ocean.
This process began about 13.6 billion years ago when the Milky Way Galaxy began to form.