[[1]] is a structural and functional unit of life.

A cell is considered the structural and functional unit of life because it is the smallest unit of a living organism that is able to carry out all of the processes necessary for life, such as metabolism, growth, and reproduction. Additionally, cells make up all living organisms, from single-celled organisms like bacteria to multicellular organisms like humans. This means that cells are the basic building blocks of life and are essential for the structure and function of all living things.