PLEAE HUR

Individuals with blood type AB is possible due to this inheritance pattern:

AA & BB,   AB & AB,   Ao & Bo,   Ao & AB,   AB & Bo

Explanation:

As long as at least one A and one B is inherited, the offspring will have blood type AB. AA & BB parent combination will pretty much guarentee an AB, but with the other options it's also possible.

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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the relative standard reduction potential of the half-cell in which reduction occurs; more positive than the other half-cell. reduction is a chemical process in which electrons are added to an atom or an ion; it always occurs accompanied by oxidation of the reducing agent.