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Consider the model of the oxygen cycle on earth. the majority of earth's oxygen reservoirs are found in the a) atmosphere. b) biosphere. c) hydrosphere. d) lithosphere.

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Color blindness is a recessive sex linked human trait. if a color blind father and a mother with normal color vision have a color blind son what must be the mothers genotype? a. xn yn b. xn xn c. xn y d. xn xn