Which of the following amino acids is polar neutral? 
Definitions:
Industry Output
The total quantity of goods or services produced by all firms within a particular industry.
Zero Marginal Cost
The scenario in which producing one more unit of a good or service does not increase the total cost of production, typically seen in digital goods or highly automated processes.
Marginal Cost
The extra expense linked to generating one more unit of a product or service.
Inverse Demand
A representation of demand that shows how the price of a good or service can vary inversely with changes in the quantity demanded.
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