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Verbal·Expression of Ideas·Transitions

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Whereas humans have trichromatic vision (a function of having three types of cone cells in the retina), birds have tetrachromatic vision;        birds have a fourth type of cone cell in their retinas, one sensitive to ultraviolet (UV) light, which allows them to see UV-reflective patterns in plumage that reveal male-female distinctions invisible to human eyes.

Which choice completes the text with the most logical transition?

A

for example,

B

likewise,

C

in contrast,

D

that is,