MCQOPTIONS
Saved Bookmarks
| 1. |
A zoologist compared the respiratory efficiency and swimming speed of different fish. He found that less efficient fish tended to have: |
| A. | Greater ventilation |
| B. | A thicker respiratory surface |
| C. | More haemoglobin |
| D. | A faster heart rate |
| Answer» C. More haemoglobin | |