Question

3.Which of Canada’s climate regions has very little vegetation and very cold weather for much of the year?
  
maritime
tundra
subarctic [i pick]
continental

Answer 1

Yes.

Answer 2

The tundra would also fall within the categories stated in the question.

Answer 3

Not really, Reiny. Tundra has a lot of plant life (but it's different than the more temperate zones).

Answer 4

Reed, the tundra in my Canada north of Yellowknife has very little vegetation and is very cold for much of the year.