Does deforestation cause the amount of carbon dioxide in the air to increase or decrease?

It's either 3 or that ,,but if not than choose 4

Adozen is 12, and your needing to calculate the weight of one medium egg, so i would do 21/12=1.75 per egg, and check your answer by doing 1.75 * 12= 21 : ) : ): ): ): ) i hoped i