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the factor that changes in an investigation and is not under the control of the investigator.
the broad band of tissue in plant organs under the epidermis, including the parenchyma cells and...
the destruction of a donated organ by the immune system of the recipient.
semi-liquid mass of partially digested food and gastric juices, produced in the stomach.
a small, corky pore or narrow line on the surface of the stem of a woody plant that allows the...