Why do dogs shed a lot of hair?

In healthy dogs, shedding is typically a natural way for your dog to rid itself of the old, unneeded and/or damaged hair that makes up its undercoat.

because they are very woolly and that makes them change their fur

the answer is b)3/8x+1

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.