Final answer:
On a phylogenetic tree, nodes represent common ancestors, and branches show evolutionary relationships based on traits.
Explanation:
A phylogenetic tree is a diagram that shows the evolutionary relationships among biological species based on genetic or physical traits. In a phylogenetic tree, nodes represent ancestors, and each node where the tree branches into two or more descendant branches represents a common ancestor. The length of branches can indicate the amount of molecular changes over time.
Learn more about Phylogenetic trees and evolutionary relationships here:
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