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An animal without a backbone or spinal column.
An animal without a backbone or spinal column. Invertebrates account for around 95% of all animal species. Modern classifications include around 30 subgroups, from sponges and flatworms to more complex animals such as molluscs, insects, arachnids and crustaceans.
Invertebrates account for around 95% of all animal species. Modern classifications include around 30 subgroups, from sponges and flatworms to more complex animals such as molluscs, insects, arachnids and crustaceans.