What happens to most of the nitrogen in a plant when the plant dies? a. it remains in the dead plant. b. it is absorbed directly into animals. c. it moves into the atmosphere. d. it goes back into the soil.

Why are carbon dioxide concentrations expected to increase? a carbon dioxide concentrations are expected to increase, because fossil fuel burning is expected to increase b. carbon dioxide concentrations are expected to increase, because of an increase in agriculture. c.carbon dioxide concentrations are expected to increase, because more land will have to be cleared for increasing populations and agricultural use. d. all of the above select the best answer from the choices provided mark this and return save and exit next submit submit