The yellow flame flickers Inference

The flame itself is a region of high heat in relatively cool surroundings. Because the heated gasses from the flame are much less dense than the surrounding air, there is a region of updraft at the flame and convection around it. Essentially it makes its own “wind” that causes the flame to flicker.

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

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