Across
- 1. is a respiratory organ found in many aquatic organisms that extracts dissolved oxygen from water and excretes carbon dioxide.
- 3. Located just below the larynx, is the main airway to the lungs.
- 5. are tiny air sacs within the lungs where the exchange of oxygen and carbon dioxide takes place.
Down
- 2. is a small hole behind each eye that opens to the mouth in some fish.
- 4. is essential to human speech.