Secondary sex characteristics are defined as changes not associated with reproduction such as hair growth, skin, and voice changes. Which option best matches this description?

• A. Changes not related to reproduction but visible
• B. Primary sex characteristics
• C. Internal changes only
• D. Changes not associated with reproduction such as hair growth, skin, and voice changes

Answer: (D)

Secondary sex characteristics are features that appear during puberty but are not part of the reproductive system itself. They are outward, visible changes that signal maturation, such as hair growth in new areas, skin changes, and the deepening of the voice. The best choice matches this idea precisely by describing changes not associated with reproduction and that are visible, with examples like hair growth, skin, and voice changes. The other options don’t fit because one points to reproductive organs (primary sex characteristics) and another suggests changes that occur internally only, which misses that many secondary traits are external and visible.