What is the basic unit of all living organisms?

The correct answer is: Cell

• The cell is considered the basic unit of all living organisms. 
• The whole organism is made up of cells that perform various functions to ensure the proper working of the body. Thus, they are known as the structural and functional units of life. 
• Each organ is made up of tissues, and each tissue is made up of cells. This statement highlights the fact that without the cell, no organism would exist.

Various types of chemical reactions occur inside he cells which are responsible for the growth, development and maintenance of all living organisms.