W When the permeability of a neuron membrane is changed, which potential is created? A. chemical potential
B. membrane potential
C. action potential
D. graded potential

the simplest case, illustrated here, if the membrane is selectively permeable to potassium, these positively charged ions can diffuse down the concentration gradient to the outside of the cell, leaving behind uncompensated negative charges. This separation of charges is what causes the membrane potential.

Explanation:

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format change of dna.  

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.