In this connection, is the shell of terrestrial mollusks greatly reduced or completely absent?

In seawater, mollusks lead a passive lifestyle, most often they get food by filtering the water. On land, to receive food and move, they need mobility, which is not there if there is a massive shell. Hence, its complete or partial reduction. For example, this is clearly seen on naked slugs.



One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.