Alexandro Is 14 Years Old and Beginning to Experience the Physical

Multiple Choice

Alexandro is 14 years old and beginning to experience the physical changes of puberty. He is a little embarrassed because he has rapidly outgrown his clothes, his voice sometimes breaks or cracks, and he has new hair appearing on his chin and face. These features are all

A) secondary sex characteristics.
B) estrogens.
C) gateway drugs.
D) STDs.