Question

Mammals are……………….blooded animals.
(a) Cold
(b) Warm
(c) All are cold-blooded with few exceptions of warm-blooded.
(d) None of the above

Answer 1

Animals are generally homeostatic that's why they are capable of regulating and maintaining a constant body temperature whereas some animals are incapable of regulating their internal body temperature with the change in environmental condition.

Complete answer:
The most important adaptation of animals is how they regulate their body temperature. Mammals are warm-blooded animals and most of the animals maintain a nearly constant body temperature and it does not change with the surrounding environment temperature. They have several internal mechanisms that help them warm up in colder areas and cool down in warmer areas. These types of animals are homeostatic.
For maintaining constant body temperature lots of energy is required, which is obtained by the breakdown of foods.

Additional information:
-Another adaptation in animals concerning body temperature is seen in cold-blooded animals.
-These animals cannot maintain a constant body temperature and their body temperature changes according to changing environmental conditions. With the change in the environmental condition, they generally migrate to suitable environmental conditions and these types of animals are also called poikilothermic animals.
-These organisms obtain energy from the surrounding environment and in some conditions, they increase their surface area to regulate the temperature and the rate of metabolism also changes with changes in the environment.
-Reptiles, insects, fishes and amphibians, etc., are poikilothermic or cold-blooded animals.

So, the correct answer is ‘Warm’.

Note:
Not all mammals are warm-blooded. Some animals are heterothermic. These animals exhibit characteristics of both poikilothermy and homeothermy. Arctic ground squirrel is an example of an extreme heterothermic animal.