Diabetes is a chronic disease in which the body cannot produce a chemical that allows cells to take up and break down sugar from the blood.

Regarding the trichromatic theory of color vision, which statement is  most  accurate?               a.  specialized cells in the retina are sensitive to blue-violet, green, and yellow-red.    b.  specialized cells in the retina engage in a process called feature detection.    c.  the theory maintains that receptor cells are grouped in pairs, such as black-white.    d.  the theory us understand why we see afterimages of different colors.