extended families, family groups that include grandparents, aunts, uncles, etc., reindeer, animals that live in cold northern regions and are often kept by people., survival, the act of staying alive in difficult conditions., to insulate, to cover something so it stays warm., essential, something that is extremely important or necessary., nomadic people, people who move from place to place instead of living in one home., herds, very large groups of animals living or moving together., lack of food, a situation when there is not enough food., ancestors, people in your family who lived long ago., vast frozen tundra, the natural environment of a cold, flat land with ice and snow..

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