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What makes a cockroach able to survive in a sewer when there is a big weakness point for them: their respiratory hole?

I know that when i wipe soap water on their respiratory hole, later on, those cockroach died, so how does those cockroach able to survive in a sewer that have dangerous inorganic chemical that could kill them?

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What do you mean by "their respiratory hole"? As every insect, cockroaches have some holes in abdomen that connect their tracheae with environment, but there are many of them and they are rather small. Besides, why do you think that cockroach is able to survive in sewer? –  Alexander Galkin Jul 17 '12 at 12:51
    
What does soap have to do with anything? You probably won't be finding soap in a sewer, and other "inorganic chemicals" may have completely different properties. –  LanceLafontaine Aug 12 '12 at 16:02
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