While at the bookstore, you listen in on an author speaking to a crowd of fans about her research and experience working with color in the clothing industry. she talks about the biology behind color, including how our eyes have thousands of receptors that are each sensitive to a different range of light wavelengths. as she continues, you realize she is explaining the theory of color vision.​?

As she continues, you realize she is explaining the "trichromatic" theory of color vision.

There are two main theories that clarify and guide study on color vision: the trichromatic and the opponent-process theory. These two theories are integral and clarify forms that work at various levels of the visual framework. As per the trichromatic theory of color vision there are three receptors in the retina that are in charge of the impression of color. One receptor is touchy to the green, another to the blue and a third to the red.  

i would say b. research typically uses a variety of sources

states grant a variety of local governments power to meet residents’ needs (source: apex learning). hope this !