71.What began as a single fertilized egg has just separated : 1408608
71.What began as a single fertilized egg has just separated into two distinct eggs. This indicates the formation of ____ twins that has occurred during the ____ period of development.
a.fraternal; zygoticc.identical; zygotic
b.fraternal; embryonicd.identical; embryonic
72.The point at which a zygote burrows into the uterine wall is referred to as
73.A physician has just informed pregnant Moesha that the human organism developing inside of her has just begun to show differentiation of its cells. As a knowledgeable student, you would know that such an organism is technically call a(n)
74.Pregnant Patty’s body is currently experiencing the event that triggers hormonal changes that will prevent further menstruation. This event is called
75.The ____ is the cluster of cells in the center of the zygote that will eventually develop into the baby.
76.I am the structure through which a mother and an embryo exchange waste and nutrients. I am called the
77.The developing human organism that has just become completely embedded in the wall of the uterus is called the
78.At five weeks after conception, a developing human is most accurately called a(n)
79.Hair and the nervous system develop during the embryonic period from cells contained in the ____ layer.
80.Damage to cells in the embryo’s ____ layer would be most likely to result in the development of a defective digestive system.