In zoology, relating to animals without a notochord or spinal cord structure.
From Greek 'a-' (without) + 'chorde' (string or cord) + '-al' (relating to), biological term for invertebrate classification.
Achordal animals represent the vast majority of Earth's creatures—they're everything from jellyfish to insects, and studying their diversity actually reveals how the vertebral column was a revolutionary innovation!
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