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Cell Membrane
The semipermeable membrane surrounding the cytoplasm of a cell, regulating the passage of substances in and out.
Proton
A subatomic particle found in the nucleus of an atom, carrying a positive electric charge.
Chemical Unit
A measurement or quantity of a chemical substance that is considered a standard or basic amount for scientific experiments and calculations.
Tissue
Groups of cells within an organism that have similar structure and function.
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