What determines the size of hail?
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Super cooled water will freeze on contact when it encounters the hail, making the hail stone bigger. The stronger the updraft, the higher the hail will travel giving it more time to collide with super cooled water droplets. Think of making a large snow ball, the longer you roll the ball in the snow, the larger it gets.

answer; ///(b) it is composed of four protein chains and four heme groups;

the sphincter muscles at the end of the digestive tract is the anus.