ANATOMY

Detailed explanation-1: -The cell is the smallest structural and functional unit of living organisms, which can exist on its own. Therefore, it is sometimes called the building block of life. Some organisms, such as bacteria or yeast, are unicellular-consisting only of a single cell-while others, for instance, mammalians, are multicellular.

Detailed explanation-2: -Cells are considered the basic units of life in part because they come in discrete and easily recognizable packages. That’s because all cells are surrounded by a structure called the cell membrane-which, much like the walls of a house, serves as a clear boundary between the cell’s internal and external environments.

Detailed explanation-3: -BACTERIA, THE SMALLEST OF LIVING THINGS.

Detailed explanation-4: -A cell is the most basic unit of life. Anatomically, it is a membrane-bound structure that contains various other organelles which perform specialized functions.