What are the functions of the comb and wattles in chickens?

The correct choice identifies that the comb and wattles play essential roles in sex differentiation and thermoregulation in chickens. The comb, which is the fleshy crest on the head, and the wattles, the hanging skin beneath the chin, are more pronounced in males and are used as secondary sexual characteristics to help differentiate between genders. This visual distinction can be crucial for breeding purposes and understanding flock dynamics.

In terms of thermoregulation, both the comb and wattles are rich in blood vessels. They help chickens regulate their body temperature by dissipating heat. When a chicken is hot, blood flow increases to these areas, allowing heat to escape. This biological function helps chickens maintain a stable internal temperature, especially in warmer environments.

Other options do not accurately reflect the primary functions of the comb and wattles. Feeding mechanisms, nesting behavior, and flight assistance are not roles associated with these features.