Which of the following is not a characteristic of poultry physiology?

The correct answer, indicating that two-chambered hearts are not a characteristic of poultry physiology, is based on the fact that poultry actually possess a four-chambered heart, similar to mammals. This anatomical feature is crucial in providing efficient separation of oxygenated and deoxygenated blood, which supports their active lifestyle and high metabolic rate.

In contrast, poultry are warm-blooded, which allows them to regulate their body temperature and adapt to various environmental conditions. They also have a feathered body, which plays a vital role in insulation, flight, and display purposes. Additionally, poultry lay hard-shelled eggs, a physiological characteristic that provides protection to the developing embryo and maintains moisture.