Final answer:
Testosterone leads to male secondary sexual characteristics during puberty, though both males and females share some common traits like the growth of axillary and pubic hair. Estrogen also influences these shared characteristics.
Step-by-step explanation:
Testosterone is the hormone that plays a crucial role in the development of male sexual characteristics during puberty. This includes the development of male genitalia and secondary sexual characteristics such as a deepening of the voice, growth of facial, axillary, and pubic hair, and the onset of the sex drive. However, both males and females experience some common secondary sexual characteristics during puberty, including the growth of axillary and pubic hair. Other shared features such as body odor changes, acne, and increased oiliness of the skin also occur due to the increased secretion of hormones. These shared secondary sexual characteristics are not attributed to testosterone alone—the hormone estrogen, predominant in females, also plays a role in these developments.