Select 2 that apply: who do scientists think that echinoderms are the invertebrates that are most closely related to the vertebrates

A. Because of echinoderms’ deuterosome mouth development

B. Because echinoderms have bilateral symmetry in the larval stage

C. Because echinoderms have a unique vascular system

D. Because echinoderms have tubular feet

E. Because echinoderms have a simple nervous system