Which of the following statements about the carbon cycle is true?a. Excess carbon that enter these ecosystems from fertilizer runoff and from sewage does cause excessive algae growth.b. Photosynthesis is an important metabolic process that moves carbon from the atmosphere into living organisms in the carbon cycle.c. Photosynthesis is an important metabolic process that moves carbon from living organisms into the atmosphere in the carbon cycle.d. Cellular respiration is an important metabolic process that moves carbon from the atmosphere into living organisms in the carbon cycle.