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Inga [223]
3 years ago
8

6. How did Earth's atmosphere change during Precambrian time?

Biology
2 answers:
Oliga [24]3 years ago
5 0
B is the best answer for this question
Sveta_85 [38]3 years ago
3 0

Answer:Precambrian oxygen was quickly used up by algae and plants.

Explanation:Around three billion years ago, the atmosphere of earth during the Precambrian time was virtually devoid of oxygen. The oxygen was produced as the byproduct of the photosynthetic activities of the cyanobacteria. The level of the gas raised and reached upto one percent about 2 billion years ago

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The components of saliva include  salivary amylase, bicarbonate  and  lingual lipase.

<h3>What is the components of saliva?</h3>

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