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a complex organic substance needed by the body in small amounts for normal growth and development.
a gland which secretes substances, usually enzymes, through a duct directly to the part of the...
the factor in an investigation that is under the control of the investigator.
epithelial tissue that lines the inner spaces of the body or organs.
also known as sodium hydrogen carbonate. It is a crystalline white solid that usually appears as...
a mass of undifferentiated cells resulting from uncontrolled mitotic cell division in body...