A whale is a A. fish B. mammal C. marsupial D. monotreme E. B and D 26. Fish jaws develop from A. the notochord. C. nose bones. E. the structures supporting the pharyngeal gill slits. A. Agnatha B. Cephalochordata C. Aves D. Urochordata E. B and D 28.
Sea urchins are in the same phylum as A. hermit crabs.
B. horseshoe crabs. C. sand dollars. E. B, C and D 29. During development, one side of a snail's gut grows faster than the other side. Because of this asymmetric growth of the gut, A. a pseudocoelom forms.