How seals can survive in polar climate where the temperature prevails below $0^{\circ} C$ ?

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 $C$

Benthic organisms are affected the most by

Distinguish between the following:

$(a)$ Hibernation and Aestivation

$(b)$ Ectotherms and Endotherms

Homeostasis is