Where does the snails egg come from?

Answer 1

they hatched out at birth and part of the shell was left over

They create their shell during development, while inside the egg. SO they have an "immature" shell at hatching.

Answer 2

Snails lay the eggs on plants or any other vegetation they can find.

Answer 3

Snails are actually born with a shell, it is as much a part of their body as our fingernails are to us.

Answer 4

when they born