What kind of characteristics do flora and fauna need to thrive in a polar environment?

So, after some advice in narrowing down the topic (used to be what kind of characteristics do animals need in different environments or something like that) I have decided to start a series! Starting with this: flora and fauna in a polar environment. So, what kind of characteristics do animals need to thrive in a polar environment? Do they absolutely need to have a dense layer of blubber to keep warm or anything like that, or would a thick layer of fur be just as good? I've heard that plants need to be small to survive, but would it be possible to have bigger plants? I mean, would it be possible to have a tree that just spread its roots out over a large area?

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What kind of characteristics do flora and fauna need to thrive in a polar environment?

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