Invertebrate
무척추동물
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<speciesfyi-glossary slug="invertebrate"></speciesfyi-glossary>Definition
An animal lacking a backbone, comprising approximately 97% of all known animal species.
Detailed Explanation
Invertebrate diversity is staggering — insects alone account for over a million described species. Their body plans include radial and bilateral symmetry, segmented bodies, and a vast range of sizes. Invertebrates perform essential ecosystem services: earthworms aerate soil, insects pollinate crops, and marine invertebrates filter water. Their decline is an early warning signal of ecosystem degradation.