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Cells level 1
the basic unit of structure and function in living things
Tissues level 2
made up of cells that are similar in structure and function and which work together to perform a specific function
Organs level 3
made up of different tissues that work together to perform a specific function or group of functions
Organ systems level 4
group of organs with related functions working together to perform body functions
Organisms
then finally a group of organ systems makes up an organism
Note 
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