The figure below shows a variety of processes that are part of the global carbon cycle.Which of the following three chemicals besides CO₂ are shown as part of the carbon cycle? 
Definitions:
Purchase Order
An official document issued by a buyer committing to pay the seller for the sale of specific products or services to be delivered in the future.
Credit Memorandum
A document issued by a seller indicating a reduction in the amount that a buyer owes, often due to a return or refund.
F.O.B. Shipping Point
A term used in shipping contracts to indicate that the buyer is responsible for the goods and their transportation costs once they leave the seller's premises.
Purchaser
An individual or entity that buys goods or services for personal use, resale, or production.
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