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2) The Proterozoic era is marked by the appearance of oxygen in the atmosphere. What had...

2) The Proterozoic era is marked by the appearance of oxygen in the atmosphere. What had to happen before oxygen reached the atmosphere?

4) What and when is the Cambrian Explosion?

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Expert Solution

2). The remarkable increase in the atmospheric Oxygen during the Proterozoic Era is attributed to the large-scale photosynthetic activities of bacteria and microorganisms. Though the photosynthetic bacteria first appeared earlier that this period, but major appearance occurred during this time, which led to oxygenation of the atmosphere. Further continued photosynthetic activities by organisms removed more and more CO2 from the atmosphere and supplied it with more and more oxygen. So this event preceded the atmosphere full of oxygen.

4). Cambrian Explosion refers to sudden and quick increases in the diversified life varieties on Earth. The Cambrian Explosion took place in the early Cambrian period from 541 million years ago to 530 million years ago. During this short period the life on Earth got diversified and Specialised into most of today found phyla of life. So due to this radical change in this comparatively short period, this event is known as Cambrian Explosion.

Amanda K answered 1 year ago
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