The correct option is D. The insulin and the glucagon hormone work together to keep the blood glucose level in the narrow range that is optimum for the health of the body. The glucagon hormone is responsible for increasing the blood glucose level when its concentration is dropping below normal while the insulin hormone is responsible for lowering the blood glucose level when its concentration is above the normal level.
1.Net Energy Gain is a concept used in energy economics that refers to the difference between the energy expended to harvest an energy source and the amount of energy gained from that harvest.
