1.
What class are starfish and sea stars?
2.
What class are brittle stars found in?
3.
What class are octopus, squids, nautilus, and cuttlefish found in?
4.
What class are snails, slugs, and gastropods found in?
5.
What class are urchins and sand dollars found in?
6.
What subphylum are sea squirts and tunicates found?
7.
What class are horse shoe crabs?
8.
What class is chiton found in?
9.
What phylum does true jellyfish go under?
A. 
B. 
C. 
D. 
10.
What class are sea cucumbers found in?
11.
What class are crabs, lobsters, shrimp, krill?
12.
What class are ostracods, copepods, amphipods, barnacles?
13.
What class are oysters, scallops, clams found in?
14.
What class are worms found in?
15.
A true jellyfish is what class?
16.
What class are tusk shells?
17.
What class are sea spiders?
18.
What phylum are Class Merostomata, Class Pycnogonida, Class Malacostraca, Class Maxillopoda?
19.
What phylum are Class Polychaeta?
20.
What phylum are Class Asteroidea, Class Ophiuroidea, Class Echinoidea, Class Holothuroidea?
21.
What class are glass sponges found?
22.
What class are sea anemones, corals, sea fans, and sea whips?
23.
What phylum are Class Polyplacophora, Class Scaphopoda, Class Gastropoda, Class Bivalvia, Class Cephalopoda?
24.
In what phylum are the Class Hexactinellida and Class Demospongiae?
25.
What class are all other sponges?