What do interior nodes on a phylogenetic tree represent a an

What do interior nodes on a phylogenetic tree represent? a. an ancestral population, which is also found in the present time b. a population that was the common ancestor of two or more descendant taxa c. an individual that gave rise to multiple modern organisms d. an individual that has no evolutionary relationship to the extant groups

Solution

b. a population that was the common ancestor of two or more descendant taxa

The internal nodes represent the common ancestor of those descendants