Assertion: vertebrate's column | /r/PartOf | final 2% of described animals
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Source sentences:
text: Invertebrates are animals that do not have a spinal column (back bone), which surprisingly accounts for around 98% of the worlds described animals with the exception of mammals, reptiles, birds and bony fish all of which have a spinal column and are therefore classified as vertebrates, making up the final 2% of described animals.