(a) List the sequence of events in the uterus of a human female from fertilisation of egg till childbirth.
(b) State the changes that are observed in the uterus if fertilisation of egg does not occur.
a)
b) If the fertilisation of egg does not occur, then the lining present in the uterus breaks down and gets released along with egg in the form of blood via the vagina. This takes an average of two to seven days and this cycle occurs every month and also known as the menstrual cycle.