Name: Mike D.
According to the heterotrophic hypothesis, autotrphs
developed after the evolution of heterotrophs partly because the primitive
environment of the earth lacked - was it carbon dioxide?
Autotrophs need a carbon source and photosynthesis does utilize carbon dioxide
for this reason. Photoheterotrophs and other heterotropic organisms may have provided the
carbon that allowed for photosynthesis to evolve. Of course, all this is hypothetical.
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Update: June 2012