How much of the electromagnetic spectrum is visible to us? all of it none of it most of it a small part of it

Fan egg cell containing the (n+1) number of chromosomes combines with a sperm cell containing the (n) number of chromosomes, what is the result of this union? a) all future somatic cells of the organism will contain the (2n + 1) number of chromosomes. b) all future somatic cells of the organism will contain the (2n - 1) number of chromosomes. c) only certain somatic cells of the organism will contain the (2n + 1) number of chromosomes. d) all future somatic cells of the organism will contain the normal diploid number of chromosomes.

What causes darkening of the skin as melanin production increases

Which phase of the cell cycle ensures that identical copies of the dna are made for daughter cells?