You are presented with the question "Reptiles are a class of tetrapod vertebrates that produce eggs with what?" and the following answer choices: 
- empty shell
 - Chemical energy
 - waterproof shell
 - water-filled shell
 - aerobic capacity
 - heat energy
 - kinetic energy
 - shell lining

Now knowing that reptiles are a class of tetrapod vertebrates that produce amniotic eggs and all reptiles produce eggs with a waterproof shell full of amniotic fluid, choose the best answer.


 

   waterproof shell      