The three sets of color receptors within the retina are sensitive to wavelengths of visible light are: select one: a. red, green, and yellow b. orange, green and purple c. red, blue and yellow d. blue, green and red

D

Explanation:

These colors are also referred to as primary colors. When mixed in different proportions, they can produce a variety of secondary and tertiary colors and this is how the human eye is also to perceive many colors even with only these three eye pigments.  

cell regulation is conducted by special proteins.

the farther away the object is from the central star (the sun) it's gravitainal pull on the object is weaker when it is farther

explanation: