Evaluate the expression without using a calculator. 
Definitions:
Earthworms
Terrestrial invertebrates that belong to the class Oligochaeta, which are known for their role in soil aeration and composting through their digestive process.
Polychaete
A class of annelid worms characterized by segmented bodies and numerous bristles, commonly found in marine environments.
Coelom
A fluid-filled cavity between the gut and body wall that is lined by tissue derived from mesoderm; the main body cavity of most animals.
Radula
A toothed, chitinous ribbon in the mouth of molluscs, used for scraping or cutting food before ingestion.
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