I need someone to type up a bit on natural selection and population dynamic. Specifically how genetic variations of trait may increase. Only a couple sentences about each increase.

the menstrual cycle – higher tier. negative feedback mechanisms affect the production of hormones in the menstrual cycle. oestrogen also stimulates the release of lh (luteinising hormone) from the pituitary gland, which in turn controls the production of progesterone.

nucleus

would be most reasonable answer tbh