Which climate zone is the largest in canada?

The 'subarctic climate zone' is the largest in Canada.

Explanation:

The orientation of Canada is high-latitudinal which naturally makes it a region that gets to experience a cold climate. Owing to its proximity to the Arctic Circle, the climate far down the central part of Canada starting from its far north is 'subarctic' type of climate. Only at the southern edge of Canada where the country shares its boundary with the United States, the climate is slightly moderate and is thus categorized in 'temperate climate'.

Answer commensalism