Question

where do reptiles lay their eggs how do they hatch

Answer 1

Most reptiles lay eggs, but in a few snakes and lizards, the eggs develop inside the mother's body so that she gives birth to live young. Crocodiles and tortoises lay hard-shelled eggs similar to bird's eggs. Turtules, snakes, and most lizards lay eggs with softer leathery shells. Sea turtles lay their eggs on beaches

To provide warmth for the small embryo so it can grow. 
To simulate the earth or ground that the eggs would be laid within in the wild.

Answer 2

Crocodilians and some kinds ofturtles lay eggs with tough shells—more like a bird's egg. Femalereptiles often build nests toprotect their eggs until they areready to hatch. Some reptilesleave the eggs to develop andhatch on their own. Otherreptiles guard the nest and take care of their young when they hatch.