How could you test for the presence of color vision in a bee?
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How could you test for the presence of color vision in a bee? Examining the retina does not help because

invertebrate receptors resemble neither rods nor cones. it is possible to train bees to approach one visual stimulus and not another. However, if you train bees to approach, say, yellow card and not a green card you do not know whether they solved the problem by color or by brightness. Because brightness is different from physical intensity, you cannot assume that two colors equally bright to humans are also equally bright to bees. How might you get around the problem of brightness to test color vision in bees?

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