HELPp

c

Explanation:

i use to do carpentry can i have brainliest i need one more to be expert and i would appreciate it

To reduce the noise entering his ears.

Explanation:

The machine he is using is really loud and unless he wants to go deaf, he needs to wear earmuffs.

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.

the answer is "a.) well–developed vascular system."

explanation: