Altitude sickness is an example of:

Which one of the following correctly represents an organism and its ecological niche?

The treeless biome of cold climates is:

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

$A$ 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 $D$.

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