Maturation basically means growth of the body, because in both genders there is a change like in female breast get bigger and I'm guessing you understand what happens to guys.
A cool down routine is important after exercise because it helps to bring your heart rate down to a normal level after increasing it during exercise.
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Pellagra is a systemic disease that results from severe vitamin B3 (Niacin) deficiency.
A species with no living members is extinct. Examples include dinosaurs, dodos, wooly mammoths, etc.
