Question

A decisive enlargement of his larynx caused jerry's voice to deepen when he was 13 years old. the larynx enlargement best illustrates

Answer 1

The larynx enlargement best illustrates a male secondary sex characteristic, which also includes hair growth and skin texture changes, this is different to a primary sex characteristic which has more to do with the genitalia and sperm production. 

Answer 2

The answer is; Secondary sex characteristics

Secondary sex characteristics refers to additional features that happen in humans as we enter the age for puberty. For a male like Jerry, the characteristics would include enlargement of larynx that caused voice to deepen, added muscle mass, increase in height, and facial hair.