The correct order from smallest to biggest is an atom, molecule, cells, tissues, organ, organ system, and organism.
What is an organism?
An organism is any living thing that grows, has cells, and reproduces. There are varieties of organisms present on the earth. Plants, animals, algae, etc.
An atom is the smallest unit, it makes up a molecule, molecules make cells, groups of cells make tissue, and tissues make organs then organisms.
Thus, the correct order is an atom, molecule, cells, tissues, organ, organ system, and organism.
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