Comparison of Vertebrate Male Reproduction
Testes, oriented vertically with anterior end upward
| Amphibian frog | |
| Avian pigeon | |
| Mammalian rat |
Comparison of Vertebrate Lungs
| Amphibian frog Part of lung is cut away to reveal sac-like internal structure | |
| Avian pigeon Note trachae attached to anterior end | |
| Mammalian rat Heart removed 2 lobes on left |
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