Ecology takes into account only

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

Ravi, who lived at sea level, had around $5$ million $RBC$ per cubic millimeter of his blood. Later when he lived at an altitude of $18,000 ft$, showed around $8$ million $RBC$  per cubic millimeter of blood. This is an adaptation because

Choose incorrect sentence

In bacteria, fungi and lower plants, various of thick-walled …$A$… are formed, which help them to survive …$B$… conditions-these germinate on availability of suitable environment. In higher plants …$C$… and some other vegetative reproductive structures serve as means to tide over periods of stress besides helping in dispersal-they germinate to form new plants under favourable moisture and temperate conditions

Choose the correct option for $A, B$ and $C$