Is a measure of the rate of degeneration of carbon 14 in organic materials.?

Is a measure of the rate of degeneration of carbon 14 in organic materials.?
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In injury of the peripheral nerve: a. pure sensory or pure motor nerve tends to regenerate better than mixed nerve b. in neuropraxia, there is anatomical disruption of the nerve c. Wallerian degeneration occurs 3 days after the injury d. Wallerian degeneration occurs proximal to the site of the injury

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