Continuing with the previous explanation on autotrophs organisms, we can say that heterotrophs organisms rely on external sources of energy for their survival, but not from the sun or from the heat or chemicals found in harsh environments, such as fumaroles, or high salty bodies of water, heterotrophs organisms consume other organisms for they to persist. Heterotrophs eat plants, animals, or other kinds of living beings to get energy in form of glucose, for they to carry out the process of cellular respiration to obtain ATP after glycolysis, Krebs cycle, and oxidative phosphorylation. Having considered this, we can say that heterotroph organisms are "B. Organisms that obtain their energy from eating energy compounds from other organisms".