Write the chemical formulas for the following compounds or ions. 
Definitions:
Cells
The basic structural, functional, and biological units of all living organisms, serving as the building blocks of life.
Endorphin Levels
The concentration of endorphins, natural pain-relieving and happiness-inducing chemicals, in the body.
Adaptive
The ability or tendency to change or adjust in response to the environment.
Anatomical Differences
Variations in the structure of organisms, often between sexes or species, that are studied in anatomy.
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