Item #12 of 15

What is co-existence?

when a neuron both releases and recycles a neurotransmitter within the presynaptic button;
the reception of more than one type of neurotransmitter by a given neuron;
the production or synthesis of more than one neurotransmitter by a given neuron;
the efflux of both calcium and sodium ions with depolarization;
none of the alternatives is correct;

INCORRECT - A correct alternative is provided.

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