A human being has 22 vertebrae, mammals have 33 . Why?

Human also have 33 vertebrae as follows:

Cervical 7

Thoracic 12

Lumbar 5

Sacrum 5

coccygeal 4

but the sacrum and coccygeal vertebrae are fused to one each in an adult human so reducing the count to 26 vertebrae and not 22

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