The figure shows regions of an ocean. In what region do phytoplankton live? 
Definitions:
U.S. Dollar
The official currency of the United States, widely used as a standard of exchange in international markets and as a reserve currency worldwide.
Income
The money received by a person or entity for labor, services rendered, investment returns, or other sources during a specific period.
Exports
Goods or services produced in one country and sold to buyers in another, contributing to a country's economy by bringing in revenue.
Demand for Currency
The desire or need for a particular currency, which can be influenced by interest rates, economic stability, and the overall economic strength of the country issuing the currency.
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