What is the proof of the unity of origin of the organic world?

Cell theory includes the following key points:
– A cell is an elementary unit of the living, capable of self-renewal, self-regulation and self-reproduction and is a unit of the structure, functioning and development of all living organisms.
– The cells of all living organisms are similar in structure, chemical composition and basic manifestations of life.
– Cell reproduction occurs by dividing the original mother cell.
– In a multicellular organism, cells specialize in functions and form the tissues from which the organs and their systems are built, interconnected by intercellular, humoral and nervous forms of regulation.

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