It is the basic unit of energy for all functions of the cell without ATP the ions wouldn't be able to transport across the cell membrane.
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Answer:
cell
tissue
organ
system
human organism
Explanation:
unicellular organisms only have one cell since two or more cells form a tissue their level of organization is restricted to cell
cell
two or more cells form a tissue
two or more tissue forms an organ
two or more organs form a system which must work in coordination for efficiency
two or more systems make up a human organism
Glucose levels increase simple sugar