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The atmosphere of early Earth probably contained no O2 until the emergence of organisms that __________. View Available Hint(s) The atmosphere of early Earth probably contained no O2 until the emergence of organisms that __________. used water as an electron source for photosynthesis used hydrogen sulfide as an energy source were chemoautotrophic had chloroplasts were oxygen respiring

Answer :

Answer:

Option (1)

Explanation:

The primitive atmosphere of the earth was comprised of little or no oxygen. After the appearance of the first primitive organisms in the oceans and other water bodies, they started to use the water as a source of electron that helped them to carry out the photosynthesis process. The primitive organisms such as cyanobacteria were able to carry out this process, in the presence of sunlight, CO₂ and water, and in return, it produced the oxygen, mostly in the form of dissolved oxygen.

Thus, the correct answer is option (1).

Martebi

The earth atmosphere is very broad. The atmosphere of early Earth probably contained no O2 until the emergence of organisms that  used water as an electron source for photosynthesis.

Studies has shown that the early atmosphere may have been composed of mainly carbon dioxide and that it has  little or no oxygen.

It also shows that there were little proportions of water vapor, ammonia and methane. Due to the cooling of the Earth, a lot of water vapor become condensed and therefore formed the oceans. A good example is when volcanoes bring forth high amount of carbon dioxide.

Learn more about the Early earth from

https://brainly.com/question/911425

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