Question

With the exception of echinoderms, invertebrates are _____; chordates, echinoderms, and vertebrates are _____.

Answer 1

protostomes and deuterostomes

Answer 2

All invertebrates except echinoderms are protostomes. Protostomes include the phylum: coelenterata, ctenophora, platyhelminths, nematyhelminths, annelida, arthropoda and mollusca.

Step-by-step explanation:

Echinoderms and chordates have tube within tube type of body plan which has evolved along deuterostomic evolutionary line. Other similarities between echinoderms and chordates (which includes vertebrates) are:

-They possess a true coelom called enterocoelom.

- They have mesodermal skeleton made of calcareous plates or ossicles.