What is the structural and functional unit of life?

Explanation

All living organisms are made up of cells. Some organisms are made of a single cell; they are called unicellular organisms, such as protozoa, Euglena, etc. Organisms like humans, which are made up of many cells, are called multicellular organisms. A unicellular organism can exist independently and perform essential life processes. Anything smaller than a cell cannot ensure independent existence; therefore, the cell is the basic structural and functional unit of all living beings.