Biology

The correct answer is: D. 4.

 

1. Understand the structure of a phylogenetic tree:

In a phylogenetic tree, the nodes (the points where branches split) represent common ancestors. The lower a node is on the tree (going back in time), the older the common - ancestor.

 

To find a common ancestor for two species, we look for the node from which their branches originate.

 

2. Analyze the branches of species C and E:

Species C branches off from a node abo...