Question

affenities between cordates and echinodermates​

Answer 1

Answer:

Explanation:

Echinoderms' nervous systems consist of a neural net without any kind of central point. Chordates have a central nervous system, called a notochord or a neural tube. In many chordates, the end of the notochord is enlarged to form a defined, centralized brain -- a feature no echinoderm has.