Multiple Choice
Many birds appear monomorphic to humans: both sexes have the same plumage. In what way do many birds vary across the sexes in plumage color that humans cannot perceive?
A) The sexes vary in ultraviolet coloration.
B) The sexes vary in infrared coloration.
C) The sexes vary in photoreceptors
D) The sexes vary in the number of photoreceptors.
E) The sexes vary in the strength of their photoreceptors.
Correct Answer:
Verified
Correct Answer:
Verified
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