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why is bogey green?

Tranquility
in Biology

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While teaching a class of 11 year olde I was stumped by the question why is bogey green? Any help would be appreciated

While teaching a class of 11 year olde I was stumped by the question why is bogey green? Any help would be appreciated
As the father of an 11-year-old, I've had to look this up before. Different colors can be caused by different combinations of bacteria, also viral infections can turn mucous yellow or green, and of course dust and smoke particulates are trapped by mucous and can give it a green-brown tint when it hardens.

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