According to adam smith, what role does individual self-interest play in directing human activity?

Where in the body can you find chemoreceptors? a. on the skin and ears, to detect pressure, touch, motion, and sound b. on the retina, to detect a single photon of light c. on the skin, to detect temperature or specific chemicals d. on the tongue and in the nose, to detect taste or odor

Factors that can increase mutation rates a. high temps b. low temps c. food additives d. uv rays

Stephen is a student who wants to test his knowledge of medical terminology. which option could he use?