[Answer] Animal phyla are defined by vertebrae — which refers to what body part?

Step 1 : Introduction to the question "Animal phyla are defined by vertebrae — which refers to what body part?"

...The taxonomic system divides the animal kingdom into vertebrates and invertebrates. Vertebrae, or spinal columns, are found in humans and animals in the phylum Chordata. Although all mammals — and many non-mammals — have spines, more than 90% of the world’s animal species are invertebrates, with insects making up the lion’s share.

Step 2 : Answer to the question "Animal phyla are defined by vertebrae — which refers to what body part?"

Spine:

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