The Living World 6th Edition by George Johnson, Jonathan Losos,William Ober,Claire Garrison

تمرين 14

One difference between the pseudocoel found in the phylum Nematoda (roundworms) and the coelom found in the phylum Annelida (segmented worms) is the pseudocoel develops between the mesoderm and the _____________ in roundworms and the coelom develops in the _____________ in segmented worms.
A) ectoderm; mesoderm
B) endoderm; mesoderm
C) ectoderm; endoderm
D) endoderm; ectoderm