<prompt> What is the effect of Progesterone-only pills?Completely suppresses ovulationThin lining of uterusThick cervical mucusAll of the above  <response>: Ref. KDT. Page. 343Progestogen-only pills have multiple biological effects on the female body.Multitude effect of POP:Inhibition of follicular developmentInhibition of ovulationSuppression of corpus luteum formationChanges in the nature of the cervical mucus which inhibits the passage of sperms into the uterine cavity Thickening of cervical mucous secretionEffects on the endometrium which affect implantation by making it thin 