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How do genes determine the traits of an organism? One fifth of a number is added to 4, giving a result of at least 3.? An unbiased coin is tossed 'n' times Let the random variable X denote the number of times the head occurs if P(X=1) ,P(X=2) and P(X=3) are? How many grams of mercury are present in a barometer that holds 7.0 mL of mercury? Please help in detail!? What is the square root of negative zero?