Lawrence Kohlberg given a theory of morality. His theory says that level of moral reasoning changes at different stages. He proposed three levels that include pre-conventional, conventional, and post-conventional moral development and each level divided into two stages.
Kohlberg's theory of moral development is good because it shows that moral development is a result of cognitive conflicts at stages. His moral theory prevent people from reacting on unchecked urges and helps them to understand right and wrong in the society.
Tadpoles start off having gills like a fish but the older they get there gills start to disappear they breathe like fish because they do have gills as younglings.
