How are photosynthesis and cellular respiration related? a. energy is continuously cycled between the two processes. b. they each occur in completely different organisms. c. both depend on atp as a source of energy. d. materials produced in one process are used in the other which of the following events represents a disruption in access to the energy source needed by an organism? a. a weed is uprooted from the soil. b. oxygen is removed from the water in a fishs bowl. c. a cactus is moved from a sunny windowsill to a dark room. d. the water bowl is removed from a hamsters cage.