Cells make up the smallest level of a living organism such as yourself and other living things. The cellular level of an organism is where the metabolic processes occur that keep the organism alive. That is why the cell is called the fundamental unit of life.
Because they come in discrete and easily recognizable packages.
Explanation:
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 cells internal and external environment.
