I don't think it's possible for snakes to become humans.
a king snake
NO. It is physically impossible for a human to give birth to a snake
It depends on your snake.
the snake doesn't know if it has a skeleton while the human does.
a snake because it has venom
No.
no
He is a snake in the form of a human.
No, it can't.
Snakes don't have "snake years". A snake's age is the same in human years.
If the snake is big enough it will just unhinge its jaws
No, a snake's age is the same in human years.