It looks like you're setting up to write down the answers for the previous questions. Here they are again:

It looks like you're setting up to write down the answers for the previous questions. Here they are again:

1. a. The process that gives off carbon dioxide into the air is respiration. b. The process that uses up carbon dioxide in the air is photosynthesis.

2. a. The process that uses up oxygen in the air is respiration. b. The process that gives off oxygen into the air is photosynthesis.

3. To increase the amount of oxygen in the air, we can plant more trees and other plants.