As thou knowest not what is the way of the spirit, nor how the bones do grow in the womb of her that is with child: even so thou knowest not the works of God who maketh all.
Ecclesiastes 11:5
Bone Growth Demonstrates Irreducible Complexity and Hierarchical Control
What seems obvious here is an overarching design plan that operates with top-level control. The process needs to foresee a desired end point, and coordinate all the activities at multiple levels, from the body plan down to the cellular machines, to achieve it. Such mechanisms can be programmed to work autonomously, but are inaccessible to natural processes lacking foresight.
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