1) Some substances not usually found in large quantities in urine would be ______, ______, ______, and ______.
2) When the sperm cell unites with egg cell this is known as ______. Usually, this happens in the ______. After four or five days, the developing zygote arrives the uterus, where it burrows into the wall of the uterus, in a process known as ______.
3) Cell division without growth is known as ______. The developing stage of the fertilized egg till it is nine weeks old is known as the ______. After nine weeks, the embryo is known as a ______. The hormone ______ is commonly tested for in the pregnancy tests, and helps to maintain the corpus luteum. This keeps level of the ______ high during the pregnancy. The connection between mother and developing embryo is a tissue known as the ______.
4) Childbirth is also known as ______. The key stages of labor are known as ______, ______, and ______.