| I: | The male frog has a pair of testes which are attached to the kidneys by a structure called mesorchium. |
| II: | The male frog's sperm travels through the urethra which also carries urine. |
| III: | External fertilization occurs, and the frog's sperm are released directly into the surrounding water. |
| 1. | Only I and II are correct. |
| 2. | Only I and III are correct. |
| 3. | Only II and III are correct. |
| 4. | All statements are correct. |