How old do u start i am need a new friend to talk about this kind of stuff with me

It depends on the family tbh I'm not aloud to date for a while but some ppl start dating at 5th grade and some start when there 15 so it rlly depends plus it has to be the right person you cant just go out and pick the first person you see and say THATS gonna be my bf/gf. NO you have to form a relationship, become friends, then see if you guys would be good together, if it seems like you won't work romantically then you can always stay friends, and in that case you gain a friend :D

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.