How do animals move?

How do animals of Porifera differ from animals of Cnidaria ?

How do some animals survive in sea water ?

How does fish move in water? What do they do to obtain oxygen?

How do good animal husbandry practices benefit farmers?

Even when a lake freezes in winters, how do the animals survive deep inside the lake.

What is the function of hairy coat in most mammals , blubber in whales and seals and feathers , birds ? How do these animals regulate their body temperature ?