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Because yeast is actually made up of living microorganisms. Keeping the yeast refrigerated keeps the yeast inactive, which means that it will still be fresh and able to make your bread rise when you take it out. If you keep the yeast at room temperature, it will die off more quickly and not last nearly as long. (Even in the freezer, yeast doesn't last forever, though.)
3 days.
Indefinately often
7 years
Blackberries (the fruit) will last about three months.
I don't know, but it'll last for a long time in the freezer.
Butter can last up to 12 months in the freezer. See Related Links.
3 months
about 2 days
uncooked can lost for one week to ten days in deep freezer
It would still be like normal, only frozen.If you have a GOOD freezer