The phylogenetic tree indicates that ________ are most closely related to chordates?
A)molluscs
B)echinoderms
C)annelids
D)arthropods

Question

Quizplus · Accepted Answer

Echinoderms are most closely related to chordates because they share a common ancestor that lived about 550 million years ago. This ancestor is thought to have been a bilaterally symmetrical, worm-like creature that lived in the sea. Over time, this ancestor evolved into two main groups: the echinoderms and the chordates.

The Phylogenetic Tree Indicates That ________ Are Most Closely Related