Is it possible to move from the hypothetical perfect competition (many buyers, sellers, identical products) to move down the lane to monopolistic

Is it possible to move from the hypothetical perfect competition (many buyers, sellers, identical products) to move down the lane to monopolistic market structure than on to oligopoly then to a monopoly? What would be an example of one? Can the same be sad going into reverse order, from monopoly down the line to the perfect competition?

Thank you and have a great night.

Dayle