Lesson 5 Invertebrate evolution and diversity which of the following is a radially symmetrical deuterostome invertebrate most closely related to chordates

The radially symmetrical deuterostome invertebrate most closely related to chordates is the echinoderm.

Explanation:

Options for this question are:

Annelid. Echinoderm. Arthropod. Mollusk.

Echinoderms, like the starfish, are a phylum of organisms derived from deusterotomates, in whose embryonic development the anus is formed first, and characterized by their pentaradial symmetry and the existence of an internal skeleton. Deuterostomy establishes a link between the echinoderms and the chordates, and the possibility that they are both descended from a common ancestor.

The relationship between invertebrates, such as echinoderms, and vertebrate organisms has been studied, establishing that hemicordates are the link that links both types of organisms.