Answer the following statements true (T) or false (F)
1. Which of the following are true of hagfish?
2. Sharks have cartilaginous skeletons because bone-forming ability had not yet evolved in vertebrates when they originated.
3. The swim bladder is an organ in primitive fish from which the lungs of terrestrial vertebrates developed.
4. The fins of lobe-finned fish are supported by extensions of the skeleton and are moved by muscles within the fin whereas the fins of ray-finned fish are supported by flexible, nonskeletal elements and are moved by muscles from within the fish's body.
1. TRUE
2. FALSE
3. FALSE
4. TRUE
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