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a sac-like structure in plant cells that contains the cell sap. It supports the cell and helps maintain its shape.
a part of the brain that is located below the thalamus having numerous functions, such as: it...
a United Nations treaty that was drawn up during a meeting of countries in Japan in 1997. It...
compounds that consist of any combination of elements, but do not usually contain carbon and...
also known as sodium hydrogen carbonate. It is a crystalline white solid that usually appears as...
simple chemical substances needed by the body in relatively small amounts for normal growth and...