Question

Which of the following is not believed to have been a component of the early Earth's atmosphere?

a. N2 (nitrogen gas)
b. H2 (hydrogen gas)
c. CO2 (carbon dioxide)
d. O2 (oxygen gas)

Answer 1

Answer:

D. O2 (oxygen gas)

Answer 2

D) Oxygen Gas

Step-by-step explanation:

Early Earth's atmosphere lacked oxygen gas due to the lack of general vegetation on Earth (plants produce O2 gas as a byproduct of photosynthesis) and the large presence of volcanic gases, which are mostly made up of CO2.