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B-lymphocytes and T-lymphocytes mature in the thymus gland.
Goods X
An unspecified product or commodity that is the subject of economic analysis or transaction.
Goods Y
A reference to a particular class or type of goods, often used in economic models.
Diminishing Marginal Rate
The Decline in the additional output produced when a new unit of input is added, with all other inputs held constant.
Substitution
The economic concept where consumers replace more expensive items with less costly alternatives, or firms replace inputs with more economical options.
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