in certain environments you might find lithotrophic growth using a variety of energy sources. in an environment containing sulfate, nitrate and o2 gas as potential electron acceptors, explain why an organism might choose not to respire using o2 gas as the terminal electron acceptor. under what circumstances might it be better to only ferment carbon compounds rather than respire using inorganic energy sources? how does this relate to the distribution of fermenters such as streptococcus or lactobacillus compared to anaerobic respiration by bacteria like nitrospira or thiobacillus?