Yes.
Yes, Arctic seals are mammals. All seals are mammals.
The Arctic is too cold for most mammals, and certainly too cold for marsupials. Only certain mammals are adapted for life in the Arctic. In addition, kangaroos are only found in the southern hemisphere, specifically Australia (and tree kangaroos in New Guinea). The Arctic is in the northern hemisphere.
You will find native animals in the Arctic, because they all form a food chain. No animal is native to the Antarctic, because it is too cold and there is no food chain. However, the Southern Ocean is home to sea birds and sea mammals that breed on Antarctica's beaches.
Possibly, if they can catch them.
No, Arctic wolves are mammals and not reptiles.
no, arctic wolves do not need to cool off because they have fur. fur helps all mammals keep warm. arctic wolves are mammals.
There are no reindeer in Antarctica, only in the Arctic. You would be much more likely to find reindeer near the Arctic. It is logically impossible to find a mammal living in the Antarctic Circle. Although reindeer would be able to survive in the Antarctic Circle, they would soon develop hypothermia.
Arctic hares are mammals and, like all mammals, they are vertebrates because they have a spine and spinal cord, and an internal skeleton. They belong to the Phylum Chordata. Mammals, birds, fish, reptiles and amphibians are all vertebrates.
Near the Arctic Circle.
You won't find them at all in the Antarctic...that's the south pole. You will find them in the Arctic Circle.
The Arctic
No, they are mammals.