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Second, they were probably unicellular organisms.
Third, they probably lived in the oceans.
The first organisms probably resembled the archaea that live today in extreme environments, such as in polar ice caps, hot springs, and the mud of ocean bottoms.
Early organisms did not require oxygen to survive, and they were probably unicellular. They resembled archaea and lived in extreme environments.
Scientists hypothesize that the small chemical units of life formed gradually over millions of years in Earth’s waters. Some of these chemical units joined to form the large chemical building blocks found in cells. Eventually, some of these large chemicals joined together and became the forerunners of the first cells.
The first cells could not have needed oxygen to survive. They were probably heterotrophs that used the chemicals in their surroundings for energy.
As the cells grew and reproduced, their numbers increased. In turn, the amount of chemicals available to them decreased.
At some point much later, some of the cells may have developed the ability to make their own food. These early ancestors of today’s autotrophs had an important effect on the atmosphere.
As they made their own food, they produced oxygen as a waste product. As the autotrophs thrived, oxygen accumulated in Earth’s atmosphere. Over hundreds of millions of years, the amount of oxygen increased to its current level.
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