1) colonial organisms are groups of unicellular or multicellular organisms for coexistence; the organisms that make up the colony can live independently;
2) multicellular organisms have a complex structure, their body consists of cells, tissues, organs, which are combined into organ systems; outside the body, these parts cannot exist, but the body is able to do without some cells, tissues or organs.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.