Which hormone is most immediately responsible for causing increases each spring in song-learning regions of the brains of male songbirds?
A) Estrogen
B) Norepinephrine
C) Testosterone
D) Melatonin
E) Aldosterone

Question

Quizplus · Accepted Answer

Testosterone is the hormone most immediately responsible for causing increases in the song-learning regions of the brains of male songbirds each spring. Testosterone levels surge in the spring, triggering changes in behavior, including an increase in singing and development of song-learning structures in the brain.

Which Hormone Is Most Immediately Responsible for Causing Increases Each