Identify examples of RRAD from the process of photosynthesis

The oxidizing agent our bodies use to obtain energy from food is oxygen (from the air). if you breathe 15 times a minute (at rest), taking in and exhaling 0.5 l of air with each breath, what volume of air do you breathe each day? air is 21% oxygen by volume. what volume of oxygen do you breathe each day?

Two critical interventions to turn around the opioid crises are:

Which process in respiration happens first? a)pyruvate processing b)electron transport chain c)krebs cycle d)glycolysis