Yes, all living organisms on planet earth require a cell because the cell is a basic structural and functional unit of life.

They are STRUCTURAL UNIT as they form the structure of the organism.

They are building blocks of life like bricks of building. Bricks combine to form walls, walls combine to form rooms which further combine to form one floor and floors combine to form building.
In similar way, cells combine to form tissues, tissues combine to form organs which further combine to form organic systems and organ system combine to form organism.

They are FUNCTIONAL UNIT as all the functions carried out by us are the functions carried out by cells.

The human body is composed of trillions of cells. Some cells take in nutrients from food, convert those nutrients into energy, and carry out specialized functions. Some cells also contain the body’s hereditary material, so make copies of themselves.

In unicellular organism single cell performs all of its life functions. In complex organisms, like plants and animals, millions of cells combine to form organs and perform different jobs….

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