Gleeson Based purely on our understanding of planet formation in this solar system, we would EXPECT earth’s atmosphere to have very high levels of , fairly low levels of , and extremely low (or even zero) levels of .

carbon dioxide, nitrogen, oxygen

Explanation:

The atmosphere of other planets in our solar system are not suitable to support life as planet earth. They are usualy too dense, such as the case of Venus, or not dense enough, like Mars´ atmosphere. Furthermore, none of them have enough oxygen.

Earth's atmosphere is very different from what our understanding of planet formation describes, with exceptionally low levels of carbon dioxide (CO2), and high levels of oxygen (O2) and nitrogen (N2).