Refer to the figure showing the adaptive immune system. 
The cell labeled 2 is a _______ and the cell labeled 3 is a _______ cell.
Definitions:
Compounded Monthly
A method of calculating interest in which the interest accrued in each month adds to the principal for the calculation of subsequent interest.
Effective Annual Rate
The interest rate that is annually compounded, taking into account the effects of compounding.
Perpetuity
A type of annuity that pays an infinite series of cash flows, with no end date.
Opportunity Cost
The financial consequence of skipping the immediate secondary choice while deciding.
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