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The following question refers to comparative concentrations, permeabilities, and potentials under various circumstances. Indicate the relationship between the two items listed in each situation by filling the appropriate letter in the blank using the following answer code:
-A. permeability of a nerve cell membrane to Na+ during the falling phase of an action potential
B. permeability of a nerve cell membrane to K+ during the falling phase of an action potential
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The initial identification or observation of a phenomenon, principle, or resource, marking a seminal moment in the expansion of knowledge or exploration.
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The creation of a new product, process, or method that has not existed before, often protected by patents.
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