Fact 1: Reptiles are a class of tetrapod vertebrates that produce amniotic eggs.

Fact 2: All reptiles produce eggs with a waterproof shell full of amniotic fluid.

Given the two facts above, answer the question "Reptiles are a class of tetrapod vertebrates that produce eggs with what?" with the following options: 
- empty shell
 - Chemical energy
 - waterproof shell
 - water-filled shell
 - aerobic capacity
 - heat energy
 - kinetic energy
 - shell lining


 

   waterproof shell      