Arrange the events in the correct sequence of events :
1) Released by the ovaries once in 28 days
2) If egg is not fertilized, the uterus lining is shed off
3) The wall of the uterus becomes thick to receive the fertilized egg.
4) This cause bleeding or menstruation
5) The ovum may or may not fuse with the sperm.
6) One ovum matures
plzz ppl itzz urgent!!!! help me.....