Warm-blooded animals like mammals from colder climates generally have shorter ears and limbs. This is an explanation of:

$A$ regulators are able to maintain homeostasis by means which ensure constant body temperature,constant osmotic concentration,etc. All $B$ and $C$ 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 $D$ and thrive whether they live in Antarctica or in the Sahara desert.
Choose the correct option for $A, B, C$ and $D$.

How many of the following pairs are correct regarding the thermal tolerance of organisms?
$(1)$ Aves - eurythermal
$(2)$ Mammals - stenothermal
$(3)$ Amphibia - stenothermal
$(4)$ Reptile - eurythermal

At what height in the Himalayan region of our country are Taiga forests located?

Give scientific reasons: Thermoregulation is more effectively achieved in larger animals than in smaller ones.

Which of the following pairs of plants,their habitat,and forest type is correctly matched,where they are typically found to occur?