The Living World 8th Edition by George Johnson

تمرين 9

Which of the following animals has a hydraulic skeleton?
A) crustacean
B) sea urchin
C) sea star
D) jellyfish
Arthropods move when muscles that are attached to the _______ contract.
A) endoskeleton
B) exoskeleton
C) bony plates
D) cellulose cell walls
Which of the following does not have an endoskeleton?
A) coyote
B) mollusk
C) sand dollar
D) frog