The answer would be "production of gametes" or the first option. Is a mature haploid male or female germ cell which could collide with the opposite sex of the germ cell then for a thing called a zygote which is diploid cell that was formed because of the two gametes cells.
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At least 75% of the history of the earth
Contents of the model cell will change color.
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a neurosecretory cell in the hypothalamus.
I believe your answer is B :)