[Solved] Which of the following is true of breasts? A)Large breasts are more sensitive to erotic stimulation than small breasts. B)Small breasts are more erotically sensitive per square inch than are large ones. C)Breasts have few nerve endings and are not susceptible to erotic stimulation. D)Breasts have no reproductive or erotic functions. Blastocyst: An early stage in human embryonic development, a hollow sphere of cells formed after several days of cell division following fertilization. Placenta: An organ that develops in the uterus during pregnancy, providing oxygen and nutrients to the growing baby while removing waste. Umbilical Cord: A flexible cord-like structure connecting a fetus to the placenta, delivering nutrients and removing waste during pregnancy. Endoderm: The inner layer of an embryonic disk, which will develop into the digestive system, liver, lungs, pancreas, salivary glands, and respiratory system.