The oxygen consumed during cellular respiration is involved directly in which process or event? ; a) glycolysis; b) accepting electrons at the end of the electron transport chain; c) the citric acid cycle; d) the oxidation of pyruvate to acetyl coa; e) the phosphorylation of adp to form atp

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.

thinking it would be d not too sure but i think it's right