The opportunity cost of an item is what you give up to get that item.
Answer: The Prairies are known as the 'Granaries of the World' due to the huge surplus of wheat production. The soil here contains high humus content which provide required nutrition to the crops. The temperature in the Prairies is also suitable for the growth of food crops.
Explanation:
When the body is given weakened/dead pathogenic material this helps build up an immune system towards the actual live infection. It prepares the body for the infection so that the person does not get sick.
Answer:
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Explanation:
