no
Yes, you can.
Generally, you are allowed to bring food such as bread to the US from Canada. There are other foods however that are not permitted.
During the early years of the nineteenth century, the first canned seafood products appeared in the United States. Initial offerings included salmon, lobsters, and oysters.
No!
Black coral is an endangered species and it is illegal to bring it into Canada and the US.
yes
yes
Peace Bridge - rules for goods brought from US to Canada?
Of course
Among other things, Canada provides the US with oil, natural gas, electricity, seafood specifically tuna and salmon. See the Related Links below for more information.
three thousand dollars
I have done it twice. Remember to declare it