Cells in the body experience changes with aging. as cells age they tend to become and as the body ages it tends to have a) larger; more cells dividing b) smaller; more cells dividing c) larger; fewer cells dividing d) smaller; fewer cells dividing

option D, smaller; fewer cells dividing

Explanation:

With aging a cell's performance slows down and after a certain period of time it dies. In this way several cell die in an aging person , thereby making an organ less functional.

The number of living and functional cells in testes, ovaries, liver, and kidneys decreases markedly with aging.

As a cell dies, it shrinks and reduces in size thereby expelling liquid out of it.

Also the rate of formation of new cells reduces with progressing age.

Therefore, as a person becomes old the cell reduces their size and hence die. Also the cell division process becomes slow

Option D is correct

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.