The outermost portion of the skin, the , is composed of epithelial cells containing keratin which gives this layer the ability to withstand damage, abrasion, and water penetration.

the answer is d. none of the above

other quantities, called derived quantities, are defined in terms of the seven base quantities via a system of quantity equations. the si derived unitsfor these derived quantities are obtained from these equations and the seven si base units.

not sure if this is what you'r looking for prokaryotes have organelles hope this out at least.