Which of the following structures collects the depolarization wave from the atria to pass it onto the ventricles?

After the depolarization wave front passes through the atria, it enters that AV node which is located at the apex of the triangle of Koch. It would be the AV node that collects the depolarization wave from the atria to pass it onto the ventricles. Hope this answers the question.

Cell division is important to single celled organisms because it allows the cells to reproduce. through cell division, cells make exact copies of themselves. when single celled organisms go through cell division, they make exact copies of themselves which is how they reproduce.