Question

Use what you learned in this unit to describe at least one way in which each of Earth’s subsystems was altered during the Precambrian era. Research additional resources as needed.

Answer 1

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

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.

Learn more about the Precambrian Era here:

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