David was speaking with his mother on the phone recently and she commented on how much his voice was beginning to sound like his father's. This is an example of which of the following?

Question

Quizplus · Accepted Answer

The change in voice pitch is a secondary sex characteristic, which refers to features that appear during puberty but are not directly involved in reproduction, such as voice changes in males, breast development in females, and pubic hair growth in both.

David Was Speaking with His Mother on the Phone Recently