The primitive atmosphere was changed during the Precambrian era. This modification enabled the emergence of many different forms of life on Earth.
The Precambrian Era refers to a period of time consisting of all of the geologic time prior to approximately 600 million years ago.
This Era (Precambrian) was characterized by a primitive atmosphere in which air oxygen was absent in important amounts.
During the Precambrian Era, the concentration of atmospheric oxygen began to rise due to the activity of photosynthetic cyanobacteria.
This increase in atmospheric oxygen facilitated the emergence of aerobic landforms and thus an explosion of biodiversity in the Earth.
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Answer:
During the Precambrian Era life was first created. The first living cells emerged, and they grew and adapted to use photosynthesis to receive energy from the sun. Through the process of photosynthesis, oxygen was released into the atmosphere. Over millions of years, the oxygen formed a thick ozone layer which protected the earth's surface from harmful radiation.
