Question

which organisms have a tail at some point, a notocord, a hollow nerve cord, and pharyngeal slits at some point?
a) arthropods
b) annelids
c) flatworms
d) roundworms
e) sponges
f) echinoderms
g) mollusks
h) chordates
i) cnidarians

Explanation:

Chordates are characterized by having a notochord, a hollow nerve cord, pharyngeal slits, and a post - anal tail at some stage of their development. Arthropods, annelids, flatworms, roundworms, sponges, echinoderms, mollusks, and cnidarians do not possess all of these features.

Answer:

h) chordates