Which of the following is a member of the Phylum Cnidaria?
A) Copepod
B) Jellyfish
C) Nautilus
D) Salp
E) Sea gooseberry
Question 2
The function of a swim bladder is ________.
A) to assist the organism in steering with the currents
B) to increase the density of the organism to keep it afloat
C) to increase the surface area of the organism to prevent sinking
D) to prevent predators from eating the puffer fish
E) to allow a fish to change position in the water column