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What is it like to have extremely low levels of serotonin? Find the probability of at most one tail appearing on two tosses of a coin. (Round your answer to two decimal places.)? Will someone please help me...I thought U and V equaled 4 times the square root of 2. But according to my answer sheet itâ€™s 4. Help!? Determine all possible ways of writing 1/21 as the sum of the reciprocals of two positive integers.? I have dark brown eyes. My DNA result gave me ''homozygous for blue eyes color''. What does that mean?