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It is composed of three separate waves

It is known as a repolarization wave (correct)

It is caused by electrical potentials generated during atrial contraction

It is a depolarization wave

Potentials generated when the atria depolarize before atrial contraction begins

Potentials generated as the ventricles recover from the state of depolarization

Potentials generated when the ventricles depolarize before contraction (correct)

Potentials generated when the ventricles repolarize after contraction

It becomes more positive on the inside and more negative on the outside

It becomes more negative on the inside and more positive on the outside

It returns to zero (correct)

It remains the same as during depolarization