What would have the greatest long-term impact on reducing the amount of carbon dioxide in the air 1. Decreasing the number of livestock on a farm
2.planting trees around a farm
4. Cutting down trees around a farm
5. Increasing the number of live stock on farm

2 planting trees around a farm

Explanation:

afforestation is one of the ways to reduce carbon dioxide in the air because during photosynthesis carbon dioxide is absorbed by the plant which in return give us oxygen

the correct answer is:

a population changes in response to a change in the environment.

we would need to see the picture to answer it