_is the age at which women who become pregnant are advised to check for chromosomal abnormalities in their fetuses. question 19 options: a.50 b.40 c.45 d.35

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.