Simplify the complex fraction. 
Definitions:
Stinging Cells
Specialized cells found in some animals, such as jellyfish, that contain a stinging structure used for capturing prey or defense.
Pores
Small openings on the surface of the skin or other tissues, often serving as passageways for fluids or gases.
Central Cavity
A hollow space within an organ or structure, often found in sponges and coelenterates, serving various physiological functions.
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