Answer:

where's the question po?

Answer : A Why?

• Invertebrates are animals that dont have a backbone.
• The vertebral column is another name for the backbone.
• Over 90% of all species on earth are invertebrates, and invertebrates species have been found in the fossil record as far back as 600 million years ago.
• Molecular biology studies suggest that all invertebrates evolve from a single invertebrate group.

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