Aquatic and Land Animal Diversity

Animals in General

What is the difference between an invertebrate and a vertebrate?

Invertebrates are animals that lack a backbone. In fact, almost all animals (99 percent) are invertebrates—biologists believe millions more may be yet undiscovered. Vertebrates are animals with backbones (vertebral column); with more than one million identified animals on the planet, vertebrates represent only 42,500—around 25 percent—of those animals.


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