Zoology - Organisms and Populations Question with Solution | TestHub

In the given diagram, A - Conformers, B - Regulators, C - Partial regulators.
Regulators can maintain homeostasis by physiological (sometimes behavioural also) means which ensures constant body temperature, constant osmotic concentration, etc. All birds and mammals and a very few lower vertebrate and invertebrate species are indeed capable of such regulation (thermoregulation and osmoregulation). Evolutionary biologists believe that the ‘success’ of mammals is largely due to their ability to maintain a constant body temperature and thrive whether they live in Antarctica or in the Sahara desert
Partial regulators change their body temperature to a certain level of ambient temperature but when the temperature continues to increase they are able to maintain constant body temperature. Examples: shrew, ground squirrel