It is a membrane that is surround the cytoplasm of a cell. They help and protect the cell.
All of the above
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I believe it is "C. Cotton sheets" because cotton is a renewable resource and since it is a sheet it is sure to be entirely made of cotton
Acid - base indicators (also known as pH indicators) are substances which changecolor<span> with pH. They are usually weak acids or bases. Consider an indicator which is a weak acid, with the formula HIn. At equilibrium, the following chemical equation is established.</span>