Carbohydrates are essential in any diet because a. they are the source of long term energy storage b. glucose is the building block of carbohydrates and is the first source of energy for the body c. they break apart into the essential amino acids d. they are a source of vitamins and minerals

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