The lungs of lungfish are thought to have evolved from _.
Correct answer: B. The swimbladder of bony fish
- A. The swimbladder of cartilaginous fish
- B. The swimbladder of bony fish
- C. The swimbladder of lobe-finned fish
- D. They evolved independently
Explanation
Lungfish have lungs that are derived from the swim bladder (an organ used for buoyancy in most bony fishes), which is connected to the alimentary tract.
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