Nevermind I got it now

digestion

it excretes wastes

just finished the test, the answer is d, greg is the least cost-effective because he charges the most for the project

homeostasis is the tendency towards a relatively stable equilibrium between interdependent elements, especially as maintained by physiological processes. and this is how it applies to the integumentary system. back to top. skin functions in homeostasis include protection, regulation of body temperature, sensory reception, water balance, synthesis of vitamins and hormones, and absorption of materials. when body temperature falls, the sweat glands constrict and sweat production decreases.

garbage disposal because lysosomes dispose of old cell parts like garbage disposals dispose of old food.