Question

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

Answer 1

C. More oxygen

Step-by-step 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.