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They survive because their body's were built to survive the cold
Another Answer
Nothing lives in Antarctica; it's too cold. So, nothing 'survives' in Antarctica.
Many animals, including penguins, seals, skuas and petrels, come to Antarctica to breed. As soon as their young are able, all the animals leave Antarctica.
The breeding animals are equipped to deal with the extreme cold weather, and the rising sun and lack of sunsets later in the spring and summer, aid in animals' ability to breed on Antarctica's beaches and in Antarctic waters.
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ViviNo animals live on Antarctica: it's too cold and there is no food chain.
Sea animals that breed on Antarctica's beaches simply return to the sea to warm up: liquid water is always warmer than the ambient air on the continent. Their food chain, as well, is in the Southern Ocean that surrounds Antarctica.
The only animals found on the Antarctic continent, are sea mammals and sea birds, that visit the continent during breeding season. All these animals find their food in the Southern Ocean. Survival is possible because of the layers of blubber, fat and other insulators between the animals' vital organs and the extreme polar climate.
Very few animals are native to Antarctica. The only notable vertebrae that live in Antarctica are seals and penguins, both of which simply use the continent to mate and rest, and sustain themselves from through the ocean. The fauna of Antarctica is largely concentrated on the coastline, as there is little in the way of food on the interior of the continent.
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