Option 3, "Nitrogen and Oxygen," is the correct answer because these two gases make up the majority of Earth's atmosphere. Here's a detailed explanation: 1. Nitrogen and Oxygen (Option 3): - Nitrogen (N2): It constitutes about 78% of the Earth's atmosphere. Nitrogen is a colorless, odorless gas that is relatively inert, meaning it does not easily react with other substances. This stability makes it a dominant component of the atmosphere.…Read More