The fact that the Basilosaurid had back legs and nostrils between the front and top of its head
and the Maiacetus has legs with webbed feet
are all examples of what type of evolution
evidence?
Fossil record
DNA comparisons
Embryology development
Comparative anatomy

many phylogenetic trees have a single lineage at the base representing a common ancestor. a lineage that evolved early from the root and remains unbranched is called basal taxon. when two lineages stem from the same branch point, they are called sister taxa.

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explanation:

well, i believe that the answer is 2. : 3