According to the trichromatic theory of color vision ____.
a. there are only three rods and three cones in each eye
b. there are only three colors of light in the world
c. rods are important for perception of light colors
d. our perception of color depends on the relative activity of three types of cones
Question 2
Strong stimulation anywhere on the skin of an Aplysia excites axons that attach to receptors and ____.
a. open potassium channels in the membrane
b. close potassium channels in the membrane
c. opens sodium channels in the membrane
d. close sodium channels in the membrane
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