Humans and baboons have noses with nostrils that face downward, but many other primates have noses with nostrils that face out to the sides. Humans and baboons are also more closely related to each other than they are to primates with outward-facing nostrils. Therefore, the fact that both humans and baboons share the downward-facing nostril orientation is an example of .
a. a shared derived trait
b. an analogy
c. a unique derived trait
d. a homology
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