a) In Canada there's more hardwood and thus it is more common in the forest product output.
b) The hardwood is predominantly on the north. Hardwood trees are the trees that usually prefer colder climates and since there's not much landmass on the south half on the Earth closer to the pole, they are mostly on the north.
c) Softwood: Pine, Cedar, Cypress . Hardwood: Oak, Birch, Poplar.