Altitude sickness is

Assertion : Animals adopt different strategies to survive in hostile environment.

Reason : Praying mantis is green in colour which merges with plant foliage.

$A$ : Antarctic fishes have blubber to withstand sub zero temperatures.
$R$ : Blubber are proteins which allow the freezing of body fluids.

$A$... regulators are able to maintain homeostasis by means which ensures constant body temperature, constant osmotic concentration, etc. All ...$B$... and ...$C$.... and is 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 $D$

If a fresh water fish is placed in an aquarium containing sea water, will the fish be able to survive ? Explain giving reasons.

Differentiation of various tissue and organs in response to light is called