3. Why do we have so many small vertebrae in our backbone?
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the backbone is made up of several small bone instead of a single bone because if there was a single bone when there is a high chance of damage to the bones when we make our body straight according to the posture.
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It provides support for the body, as well as valuable protection for the spinal cord. The fact that our bodies are supported by an internal skeleton as opposed to an external one also allows for a greater range of movement, and means vertebrates can grow to far greater sizes than any invertebrate ever has
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