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Single Resource Economy ⇒ A nation rich in precious gemstones just exports diamonds to be made into necklaces, rings and other jewellery.

A singe resource economy is one where the country depends largely on a certain natural resource. This country is dependent on diamonds to a large extent so is a single resource economy.

Specialization⇒ A nation with many pineapple plantations exports fresh pineapples, canned pineapples and other pineapple products.

This is specialization as specialization involves focusing efforts on the production of a certain good. This country is specializing in the production of pineapples and associated products.

Diversified Economy ⇒ A nation with several climatic zones exports almonds, cranberry, corn, wheat and peaches.

A diversified economy would be one where there is a production of various goods and services. This nation produces a variety of crops so it is diversified.

you should think about the answers you give and expect the same form your questions.