: photoheterotrophic organisms . . . choose one: a. can use light to fix co2, but still must acquire reduced compounds from the environment as electron donors to power atp synthesis. b. can use light as an energy source, but still must acquire reduced carbon from the environment. c. can use light to extract energized electrons from reduced minerals, but still must acquire reduced carbon compounds from the environment as electron donors to power atp synthesis. d. only existed on early earth
