The sequence would be as follows: cells - tissues - organs - organ system - organisms
Let's take a look at each of these levels: Level 1: Cell Cells are the smallest building unit of any structure within the organism. Level 2: Tissue a tissue is a group of cells having the same function and structure that are bound together to perform a certain function in the body Level 3: Organ an organ is a group of tissues bound together to perform a certain function Level 4: Organ system groups of two or more organs that work together to serve a certain function in the body Level 5: Organism the entire living thing formed of different organ systems
