Question

Given the following phylogenetic tree, which evolutionary event occurred most recently?

A.) development of different forms of symmetry.

B.) development of tissues.

C.) each of these traits evolved at the same time.

D.) protostome and deuterostome development.

Answer 1

Option-D

Step-by-step explanation:

A phylogenetic tree is a diagrammatic representation which is constructed in to show the common ancestors at the base of the tree and the branches represent the new species.

The phylogenetic tree which is constructed based on the traits evolved during evolution is known as a cladogram. In the given question, the cladogram represents the evolution of various groups of the organism from a common ancestor based on the traits evolved.

The trait which was evolved earlier is present at the base like the development of tissues while the most common trait is present at the top which is the development of deuterostome and protostome.

Thus, Option-D is the correct answer.