on, Survival in the Arctic depends ______ warm clothing, food supplies, and cooperation., frozen, People travel across the vast ______ tundra for hundreds of kilometres., house, Nomadic families often move ______ several times a year to find better grazing grounds., valuable, Reindeer are extremely ______ to nomadic people because they provide food and transport., lack, Life becomes much harder when there is a serious ______ of food., herds, Large ______ of reindeer move together across the tundra..

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