Refer to the figure showing the digestive systems of an earthworm and a cockroach. 
Which component of the digestive system is found in only one of the organisms in the figure?
Definitions:
Constant Rate
A steady, unchanging rate of growth or decline, often used in the context of compounding interest or depreciation.
Expected Growth Rate
The projected annual rate at which an investment or a company's earnings are expected to grow.
Constant Growth Model
A model used to estimate the value of a stock assuming that dividends grow at a constant rate indefinitely.
Required Return
The basic yearly rate of return essential for inducing companies or individuals to invest money into a specific project or security.
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