Under normal circumstances, the Fund invests at least 80 percent of its net assets (plus the amount of any borrowings for investment purposes) in equity securities of companies primarily engaged in natural resources and natural resources-related businesses. The Fund considers companies primarily engaged in natural resources and natural resources-related businesses to be those with a majority of assets, revenues or earnings, directly or indirectly through subsidiaries, from owning, producing, refining, processing, transporting, distributing, mining, exploring, storing, or otherwise handling natural resources, or from activities that directly rely on or support natural resources, such as producing food, delivering utilities, selling machines for natural resources uses, and deriving materials such as fertilizer, glass, paper and plastic. The Fund considers natural resources to generally include, but not be limited to, metals, agricultural products, timber, water, energy (including fossil fuel and renewable sources), and chemicals. The Fund invests more than 25 percent of its net assets, in aggregate, in companies primarily engaged in natural resources and natural resources-related industries. The Funds investments in equity securities may include common stocks, American depositary receipts (ADRs), European depositary receipts (EDRs), global depositary receipts (GDRs), non-voting depositary receipts (NVDRs), U.S. dollar-denominated foreign stocks traded on U.S. exchanges, and master limited partnerships.