Examlex
Which of the following regions once held the United States' largest coal reserves?
Need
A requirement for survival or achieving a specific goal.
Goal
An objective or desired outcome that a person aims to achieve.
Leptin
A hormone, secreted by fat cells, that is associated with decreasing eating behavior based on long-term body fat regulation.
Ghrelin
A hormone, secreted by an empty stomach, that is associated with increasing eating behavior based on short-term signals in the bloodstream.
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