The answer is: [C]: pure sociology .
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Note: "Pure sociology" is also known as "basis sociology".
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Stretching increases flexibility, sit-ups are for abdominal endurance, and distance running are for leg muscle endurance, so the correct answer is pull ups.
Well, It depends of what the breed is, I don't think there is an answer of how many dogs die at age 5, It varies.
It is important to learn them just in case of an emergency
