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Determine where the function is concave upward and where it is concave downward.
Pacemaker
An electronic device implanted in the body to regulate the heart rate.
Platelet Count
A blood test that measures the number of platelets, which are essential for clotting, within a specific volume of blood.
Soft Bristle Toothbrush
A toothbrush designed with softer bristles that are gentle on the gums and teeth, recommended for preventing damage to dental tissues.
Fresh Fruit
Natural, unprocessed fruit that has not been canned, cooked, or altered from its original state, rich in nutrients and fibers.
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