Before puberty, children do have an estrogen level in their body. This is only truly noticeable around the time of puberty. It's always there, but not hyperactive until puberty.
Mitosis cells is a type of cell division that results in two daughter cells each having the same number and kind of chromosomes as the parent nucleus, typical of ordinary tissue growth.
A biogeochemical cycle is a pathway by which a chemical substance moves through both biotic and abiotic compartments of earth
I believe the awnser is B
