Answer: Cells are the simplest structure to fit all the characteristics to necessary to be considered alive.
Step-by-step explanation:
Cell is the smallest and basic units of life I.e it is the building blocks of living organisms. Cells can exist on their own. Cells are the smallest unit of life because they are the smallest components of living organisms and have simplest structure to fit characteristics to be considered alive.
These characteristics are exhibited by living cells and they are;
Reproduction, feeding,respiration, movement, sensitivity, excretion ,growth and death.