How is a multicellular organism different from a unicellular one?

A single-celled organism has everything you need for life – nutrients, minerals and more. All this is necessary for the life support of the cell. That is, it can exist independently and receive nutrition from the environment.
In a multicellular organism, cells are divided according to specialization, each cell performs only its function, supporting and providing all the necessary other cells in the body.

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.