During the last year, Davis noticed that he started to grow facial hair and is now able to sing lower notes in choir. These characteristics are caused by

Question

Quizplus · Accepted Answer

The growth of facial hair and deepening of voice are secondary sex characteristics that are stimulated by testosterone, a hormone produced by the testes in males. Androstenedione is an intermediate hormone that can be converted to testosterone, but it does not directly cause these specific changes. FSH (follicle stimulating hormone) is involved in the production of sperm, while penis size is determined by a variety of genetic and environmental factors, and is not directly related to the changes described in the question.

During the Last Year, Davis Noticed That He Started to Grow