What is the basic unit of life?

The basic unit of life is the cell. Cells are the smallest structural and functional units of living organisms. They are often referred to as the building blocks of life because they perform essential functions necessary for the survival and reproduction of an organism. Cells can exist as single-celled organisms, like bacteria and amoebae, or as part of multicellular organisms, such as plants and animals. Each cell carries out various processes such as metabolism, energy production, and response to stimuli, all of which contribute to the overall function of the organism.

In contrast, atoms are the fundamental units of matter but do not constitute life on their own. Tissues are groups of similar cells that work together to perform a specific function in an organism, while organs are structures composed of multiple tissue types that work together to carry out complex functions. Stripped down to its essence, the cell is the fundamental unit from which tissues and organs are formed, making it the cornerstone of life.