What secondary sex characteristic does testosterone produce in males?

Which safe and legal options do teen parents have if they think they are not ready to be parents? check all that apply. leave the baby in front of someone's door. surrender the baby under their state's safe-haven laws. place the baby for adoption. release custody to the baby's grandparents. give the baby to a stranger.

How could natural selection best be used to explain the evolution of the white fur of arctic fox

How do people attempt to explain the behaviors of others?