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Discuss the difference in environmental availability of phosphorus versus sulfur and nitrogen.
Fiat Currency
A currency that the government has declared to be legal tender but is not backed by any physical commodity.
Legal Tender
Legal tender is currency that must be accepted if offered in payment of a debt; typically issued and regulated by a government.
Physical Commodity
Tangible goods that are traded, often used as inputs in the production of other goods or services, such as oil, gold, or wheat.
Precious Metal
A classification for metals that are considered rare and have a high economic value, such as gold, silver, and platinum.
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