Is commerce limited to distribution (discuss)​

Physical needs include: a. the need for sleep b. the need to feel safe c. the need to feel secure d. all of the above

Which theory of color vision most accurately describes the process of color vision at the level of the retina?

You find a mysterious, dull substance on the ground and pick it up for a closer look. it is powdery, very light, and soft to the touch. the substance is most likely i. an organic mineral ii. a metallic mineral iii. a nonmetallic mineral i only ii only iii only i and ii i and iii