Pick from: A. digestive system. B. nervous system. C. brain. D. backbone.
Q: Answer the following question given this paragraph: Cephalochordata: Cephalochordates include the lancelets ( Figure below ), fish-like marine animals often found half-buried in the sand. Cephalochordates have a notochord and nerve cord but no backbone. Q: Cephalochordates have a notochord and nerve cord but not a? A:
A:
D.