You have to do more research. A letter may be needed from the manufacturer, and you will need to get it inspected, you'll also need to export it from the USA before importing. Make a mistake and the vehicle may be shredded.
Generally, you are allowed to bring food such as bread to the US from Canada. There are other foods however that are not permitted.
I believe that any vehicles that are 'legal' on the roads in Canada are also considered 'legal in the US. Many of the vehicles sold and driven in the US are actually built in Canada.
No!
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
vehicles, except railway or tramway, and parts.
vehicles, except railway or tramway, and parts
Yes, you can bring dogs into Canada from the US, but you must meet certain requirements such as having a valid rabies vaccination certificate and a health certificate issued by a veterinarian.