Traits are critical in the study of phylogeny because:
a. A phylogenetic tree is a hypothesis about evolutionary relationships.
b. We need to use observation of traits to infer patterns of ancestry and descent among popula-tions.
c. By mapping individual traits onto a phylogeny we have already created, we can study the se-quence and timing of evolutionary events.
d. B and C.
e. A and C.
D
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