Final answer:
During the third month of fetal development, external sex organs start forming, along with other significant developments.
Explanation:
During the third month of fetal development, the external sex organs start to form, among other processes such as hair development, tooth formation, and the continued development of excretory and digestive systems. The fetus also begins to exhibit human-like characteristics such as movement, sleeping, and sensory development, being able to respond to sounds and tastes. By the end of the third month, the sexual organs become visible, marking an important stage in fetal development.
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