Hello guys can help me on the question below.

Two plant breeders have collaborated to test best varieties at ten locations representing the area where varieties are likely to be produced. At the end of season, they consult their resident biometricians to determine how best to analyze the data. one   has told to consider locations to be a random effect and other is advised that the environment are fixed effects .

(a) would  environment  be considered to be fixed or random  and why? 

b)  would varieties be considered  to be fixed or random and why?

c)why does it matter whether environments and varieties are considered to be fixed or random ?

thank you in advance

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