Which of the following is considered the fundamental unit of life?

The cell is considered the fundamental unit of life because it is the smallest structure that can carry out all of the processes essential for living organisms. Cells are the basic building blocks of all living things, and they can perform functions such as metabolism, growth, reproduction, and response to stimuli. Every organism, whether unicellular or multicellular, is composed of cells, and these cells can vary widely in structure and function across different types of life.

Atoms and molecules, while essential components of cells, do not possess the characteristics of life on their own; they do not carry out biological processes. Tissues consist of groups of similar cells working together to perform specific functions, but they are not the smallest units capable of independent life. Thus, the cell's role as the fundamental unit embraces the essence of biological organization and function.