The biological phylum containing segmented worms, including earthworms, leeches, and marine worms.
From Latin 'annellus' (small ring), from 'annus' (year/ring), referencing the ringed or segmented bodies of these worms; coined as a scientific classification in the early 19th century.
Earthworms are basically nature's hydraulic systems—they use water pressure in their segments to move, making each ring not just a body part but a mini-engine!
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