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How many species have internal skeletons?

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The human skeleton is the internal framework of the body. It is composed of around 270 bones at birth – this total decreases to around 206 bones by adulthood after some bones get fused together

User Jencoston
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6.2 skeletons, there are 3 different types there is hydrostatic, endoskeletons and exoskeletons

User Pedro Soares
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