The most likely was present in Earth's early atmosphere is "Presence of inorganic molecules".
What is inorganic molecule?
A molecular entity known as an inorganic molecule would be one that typically would not fall into the categorizations of coordination compounds, organometallic compounds, as well as organic compounds.
What is atmosphere?
The atmosphere, a concoction of gases, envelops the earth. The atmosphere upon Earth contributes to the viability of life.
The classic atmosphere of Earth would have been deficient in free oxygen and even though abundant in methane, ammonia, water vapour, and thus the noble gas neon.
The most likely was present in Earth's early atmosphere is "Presence of inorganic molecules".
Hence, the correct option will be (3).
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