Yup to true, so the correct answer is true!!! Hope this helps!!!
C) Natural selection
When something happens in nature and something changes all of a sudden, the animals tend to adapt to what gives them more chances of survival. As a result, a large amount of the population would attempt to adapt in a way that helps them survive.
The atmosphere of Earth contains primarily nitrogen, 78.09% of nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide, and small amounts of other gases.