<span>I think this might be referring to alleles </span>
What exactly is the question here? Please answer so i can help you! :)
Are there multiple choices?
The one that is radially symmetrical deuterostome invertebrate that most closely related to chordates is : B. echinoderm
This organisms doesn't have a backbone and known for being radially symmetrical. An example of a echinoderm is a Starfish
hope this helps
