Most mutations lead to a decreased chance of survival for the mutant organism. rarely, a mutation can provide an increased chance of survival. these rare mutations provide a(n) for the mutant.
a. selective disadvantage
b. environmental susceptibility
c. directional shift
d. adaptive
e. selective advantage

answer; i believe that the correct answer is (light);

i think its c. amphipod

both anaerobic and aerobic respiration use glucose (or other carbohydrates), proteins and lipids to produce atp and nadh. cell uses those energy molecules, obtained from food and   breaks them down during the chemical reactions of respiration. in anaerobic respiration, nadh is regenerated to nad+ by enzymes lactate dehydrogenase (lactate is produced, e.g. in muscle cells) or by alcohol dehydrogenase where ethanol is produced (alcohol fermentation), while in aerobic respiration, electrons from nadh are deposited in the mitochondria to regenerate nad+ (electron transport chain. anaerobic respiration produces 2 atp per molecule of glucose compared to aerobic respiration where about 38 atp molecules are produced.