Although a certain molecule is involved in a specific reaction, its structure and chemical composition are exactly the same before and after the reaction. This molecule is most likely made of which macromolecule?

Which mantle is under the crust the upper mantle or the lower mantle i think it's upper let me know if i'm right

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.

Plz ! ive been stuck on this forever