On the borderline between radiology and surgery, stereotactic radiosurgery or ________ knife surgery is a noninvasive technique that is currently used to treat brain tumors in a one-day session.

Ionic or covalent compound that is used commercially in the form of a homogeneous mixture of two or more substances is called a

a. Solvent b. Solute c. Solution d. Substance

Calcium is necessary for which bodily function?

a. thyroid hormone regulation b. digestion c. energy storage and transfer d. blood clotting