Which of the following is a correctly matched pair of a phylum and its characteristic feature?

Step-by-step solution

Aschelminthes possess a body cavity that is not lined by mesoderm; instead, the mesoderm is present as scattered pouches between the ectoderm and endoderm. Hence, they are pseudocoelomates. This makes it a correct match. Adult echinoderms exhibit radial symmetry, whereas it is their larval stage that is bilaterally symmetrical. Ctenophores are diploblastic animals, possessing only two embryonic germ layers (ectoderm and endoderm). Hemichordates are bilaterally symmetrical, triploblastic, and coelomate animals. Answ