When compared to Earth’s atmosphere 4.5 bya, Earth’s atmosphere today has.

A. More carbon dioxide

B. More methane

C. More oxygen

D. More copper

C. More oxygen

Explanation:

The world 4.5 billion years ago had hydrogen sulfide, methane, and ten to 200 times as much carbon dioxide as today’s atmosphere. After about half a billion years, Earth’s surface cooled and solidified enough for water to and oxygen collect on it.

answer; i believe that the correct answer is (lung);