why are cells called basic unit of life
Cells are the building blocks of life. They are the smallest living entities in a living organism. They perform functions necessary for the survival of the organism, such as respiration, digestion, excretion, protection from pathogens and so on. Each cell performs a specific function in the body. Therefore, cells specializing in one function are often grouped together in the body. This means that a particular function is carried out by a cluster of cells at a definite place in the body. In this way, different functions are performed by different groups of cells in an organism. This constitutes the organization at cellular level. That is why cell is called basic unit of life.