Examlex
Voluntary exchange is based on the principle that all parties must gain from trade.
Bloodstream
The flowing body fluid that delivers necessary nutrients and oxygen to the cells and transports metabolic waste away from those same cells.
ATP
Adenosine triphosphate, a molecule that stores and transfers energy within cells, serving as the main energy currency of the cell.
ADP
Adenosine diphosphate, a molecule involved in the energy transfer within cells.
Radiation
The emission or transmission of energy in the form of waves or particles through space or a material medium, including electromagnetic radiation like light and radio waves, and particle radiation like alpha and beta particles.
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Q167: The federal budget deficit in 2009 was