A cell is the smallest living unit.

Cells form tissue when they work together.
Tissues form organs when they work together.
Organs form systems when they work together.
Systems form an organism (or living thing) when they work together.

These are the structures from the simplest to the most complex:
celltissueorgansystemorganism (or living thing)

Cell, tissue, organ, system and organism
Source | BBC Curriculum Bites

A Medley of time-lapse of cells and organisms videos
Video credit | Carlson C
Source | Microscope Imaging Station

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