Why double circulation ideal for an active animal to maintain its own body temperature?
Double circulation is where there are two loops to the cardiovascular system - one that supplies blood to the peripheral tissues and one that takes deoxygenated blood to the lungs. This has very little effect on maintaining a constant internal temperature.
By the definitions of warm blooded and cold blooded, animals cannot be both. Cold blooded means that the animal cannot maintain a constant body temperature and instead its body temperature is dependent on the environment. Warm blooded refers to animals that can maintain a relatively constant body temperature independent of their environment.
How can the temperature of a substance remain the same even if the substance is absorbing thermal energy?
Warm blooded animals have internal mechanisms that regulate their body temperature, making them less dependent on the ambient temperature. Cold blooded animals do not have this mechanism and so are more directly influenced by the temperature of the space around them. A warm blooded animal can be highly active in the cold, but requires much more food to maintain such an active metabolism. Cold blooded animals slow down in the cold and become more active…