Question

The development of the song system in male songbirds depends on: a. direct connections between sensory neurons and motor neurons. b. a decrease in the number of neurons in the song system. c. the behaviors of females, which stimulate hormone production. d. the successful defense of a territory. e. the production of estrogen early in life.

Short answer

The correct answer is: the behaviors of females, which stimulate hormone production.

Step-by-step solution

Understand the Given Options

Studying each option meticulously. Consider the scientific facts about the sensory-motor relationship, neuron quantity, hormonal influence, territory defense, and early life estrogen production.

Applying Biological Understanding

After understanding the options, apply the knowledge of avian biology. Know that the song system in male songbirds is influenced by various factors - primarily hormonal.

Evaluate Each Option

Start the evaluation. Scientifically, direct connections between sensory and motor neurons (Option a) are significant for all birds, but not specifically for the development of song system. Similarly, a decrease in the number of neurons (Option b) may impact functionality, but is not a factor in song system development. The defense of territory (Option d) is a behavioral aspect and does not directly impact the song system development. Lastly, early production of estrogen (Option e) impact the birds' overall development, not specifically the song system.

Identify the Correct Option

Take into account the correct option. As per the known biological understanding, song system development in male songbirds is closely associated with the behaviors of females, which stimulate hormone production. Thus Option c is the correct answer, as this statement aligns with scientific facts.