The Precambrian witnessed the development of
A)the first atmosphere.
B)the ozone layer.
C)photosynthesis.
D)photosynthesis,an oxygenated atmosphere,and the ozone layer.

Question

Quizplus · Accepted Answer

The Precambrian era saw the development of photosynthesis, which led to an oxygenated atmosphere and the formation of the ozone layer. Therefore, option D is the correct choice. Option A is incorrect as the first atmosphere is believed to have formed during the Hadean eon, which precedes the Precambrian. Option B is incorrect as the ozone layer is a result of the accumulation of oxygen in the atmosphere, which was a gradual process that occurred during the Precambrian. Option C is partially correct as photosynthesis did develop during the Precambrian, but it led to the formation of an oxygenated atmosphere and the ozone layer, which is not specified in option C.

The Precambrian Witnessed the Development of