What is the correct classification of the following reaction? 
Definitions:
Spicules
Small, pointed structures made of silica or calcium carbonate serving as a skeletal element in sponges and other invertebrates.
Flagella
Long, slender appendages that protrude from the cell body of some bacteria, protozoa, and spermatozoa, used for locomotion.
Sponges
Simple aquatic animals with a porous body that water flows through, belonging to the phylum Porifera.
Nerve Fibers
Long, thin extensions from neurons that transmit nerve impulses to other cells.
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