How does the type of circuit and bulb affect the strand of light with burned out bulb?

IV Type of circuit  and bulb

DV Strand of light with burned out bulb.

Hypothesis: If the Christmas lights are arranged in a parallel  circuit then when 1 bulb burst (is removed) the out her bulbs will light up.

Observation: I noticed that the light bulbs light up.

Observation: I noticed if you remove one bulb the other bulbs still light up.

Observation: I noticed that all the bulbs light up.

Observation: I noticed that the bulbs did not light up.

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