Carbon Dioxide
Carbon dioxide
Early organisms in the Precambrian era converted carbon dioxide to oxygen through photosynthesis. This process eventually led to the increase in atmospheric oxygen levels, paving the way for the evolution of more complex life forms.
Oxygen
life arose and the atmosphere became enriched in oxygen
the Precambrian era
**Precambrian**
Oxygen was lacking from Earth's atmosphere during the Precambrian era. This period of Earth's history, which spans from about 4.6 billion years ago to around 541 million years ago, is characterized by low oxygen levels in the atmosphere due to lack of photosynthetic organisms producing oxygen.
The Great Oxidation Event occured during the Proterozoic Eon around 2.4 billion years ago. This event led to a significant rise in atmospheric oxygen levels, marking a major turning point in Earth's history.
The two subdivisions of the Precambrian Era are the Hadean and the Archean Eons.
During the Precambrian era, the atmosphere was mostly composed of gases like carbon dioxide, methane, water vapor, and nitrogen. There were lower levels of oxygen compared to present-day levels. The lack of oxygen contributed to the different forms of life that existed during that time.
85% of earths history and the earliest era that exists. bacteria mostly survived then and built up oxygen until a mass extinction.The. Era had many extinctions because of large variations in climate is what mesozoicor cenozoic or precambrian which one
The biggest change in the Earth's atmosphere between the Precambrian and Paleozoic eras was the increase in oxygen levels. During the Precambrian, oxygen levels were very low, but during the Paleozoic era, oxygen levels rose significantly due to the evolution of photosynthetic organisms. This increase in oxygen had a significant impact on the evolution and diversification of life on Earth.