Choose the correct term to make the statement correct: Rising and sinking of gas within the zones and belts are examples of ____(conduction, convection, radiation)____. 
Definitions:
Amino Acids
Organic compounds that serve as the building blocks of proteins, consisting of both an amino group and a carboxyl group.
Blood Calcium
The concentration of calcium ions in the blood, crucial for bone health, nerve function, muscle contraction, and blood clotting.
Parathyroid Hormone
A hormone released by the parathyroid glands important for maintaining a stable level of calcium in the blood.
Insulin
A hormone produced by the pancreas that regulates the amount of glucose in the blood.
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