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If a pile of petfood shrinks down due to being eaten, is this a form of entropy? What is the difference between an Algebra 1A (P) Class and 2 Year Algebra 1? Some of my friends got 2 Year Algebra 1 and I got Algebra 1A? Question number 16 in given pic? Why human evolve so slow? And are they evolving forward or backwards? Why? What is 850 1/3 of?