Will mark as
which of the following is true of red blood cells?
a. once created in bone marrow, they circulate for our lifetime
b. they live for only 120 days
c. they live for only about 20 days
d. they have multiple nuclei

answer: b

coz red blood cells marrow and circulates the body for 120 days.

it's unlikely a majority of a large population would agree on issues

hope this : )

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.