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 ______.