+Invertebrates are animals without a [Backbone](/wiki/backbone), forming the vast majority of life on Earth. Diverse and numerous, these [Animal](/wiki/animal) groups range from microscopic organisms to giant squid, thriving in nearly every ecosystem.
+## See also
+- [Arthropod](/wiki/arthropod)
+- [Mollusk](/wiki/mollusk)
+- [Echinoderm](/wiki/echinoderm)
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