For the development of the embryo of a reptile, water is needed. Where does it come from? How does it work?

1) The source of water is the fat in the egg.
2) Fat is oxidized to water and carbon dioxide

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.