Multiple choice The structure Placenta is an association of tissues between the oviducal wall of the mother and uterine wall of the foetus oviducal wall of both mother and foetus uterine walls of both mother and foetus uterine walls of mother and some other parts of foetus Reveal answer Fill a bubble to check yourself D Correct answer Explanation The structure Placenta is an association of tissues between the uterine walls of the mother and some other parts of foetus.