Based on the information provided in this figure, where does the oxygen gas produced by a leaf come from? 
Definitions:
Present Value
The current worth of a future sum of money or stream of cash flow given a specified rate of return.
Compound Interest
The addition of interest to the principal sum of a loan or deposit, where interest also earns interest from that moment on.
Earnings Rate
The return on an investment or the rate at which a company or asset generates income, typically expressed as a percentage.
Rate of Return
The profit or loss of an investment over a specified period, expressed as a percentage of the investment’s initial cost.
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