Ascidians are sac-like marine invertebrates. Their larvae have well-developed brains and dorsal nerve cords. This suggests that ascidians should be classified with the
A. annelids.
B. sponges.
C. cnidarians.
D. chordates.

Question

Ascidians are sac-like marine invertebrates. Their larvae have well-developed brains and dorsal nerve cords. This suggests that ascidians should be classified with the
	A.	annelids.
	B.	sponges.
	C.	cnidarians.
	D.	chordates.

anonymous · Answer

Ascidians are commonly called sea squirts, and unlike sponges have spinal nerve cords in the larvae form.  So cancel out B right away.  If you recall the phylum that has dorsal (back) nerve cords in it...

Hint:  "Cord" → "Chord"