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Answer:
1. The defining characteristic of a series circuit is that there is only one path for current to flow.
2. As more and more light bulbs are added, the brightness of each bulb gradually decreases. This observation is an indicator that the current within the circuit is decreasing. So for series circuits, as more resistors are added the overall current within the circuit decreases.
3. In this case, because electricity can flow in more than one path, even if one of the bulb blows out, the other bulb will still have electrons flowing through it and it will continue to glow. In the same way, if one of the bulb is unscrewed, it would not prevent the other bulb from lighting up.