Reading Chapter 25
Identify the letter of the choice that best completes the statement or answers the question.
____ 1. In most fishes, the structures that are most important for obtaining oxygen from water are the
____ 2. The first vertebrates to evolve were
____ 3. The organ that adjusts the buoyancy of many bony fishes is the
____ 4. Modern jawless fishes include
____ 5. The eggs of amphibians can dry out easily because they