The citric acid cycle has a unique circular appearance when written due to the regeneration of oxaloacetate.Which of the following molecules is oxaloacetate? 
Definitions:
Fuel Efficiency
A measure of how effectively a vehicle uses fuel, often expressed as the distance traveled per unit of fuel.
Marginal Social Benefit
The additional benefit received by society from producing one more unit of a good or service.
Marginal Social Cost
The overall expense to society of producing one additional unit of a good or service, including both private costs and any externalities.
Coal Mine Pollution
Environmental contamination resulting from the extraction and processing of coal, including air and water pollution.
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