What are organisms that use chemical substances as a source of energy?

1 Answer
Aug 8, 2018


Is this not ALL organisms?


Autotrophs (green plants for instance) use solar energy to fix carbon dioxide to make simple sugars..

#6CO_2 +6H_2Ostackrel(Delta,"photosynthesis")rarrC_6H_12O_6 + 6O_2uarr#

Heterotrophs consume the sugar so produced...
in the process of respiration...

#C_6H_12O_6 + 6O_2rarr6CO_2 + 6H_2O + Delta#

Is respiration the reverse of carbon fixation?