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Yeah, I was talking about the change in feeding habit of organisms. How do they cope with their nutrition requirement been modified to suit their new environment and yet survive. For instance how could those bugs survive on detergent and alcohol. Is it not weird?.

A good rule of thumb is that if there's a way to shuffle electrons on carbon, some bug somewhere is doing it. Unlike us, a lot of bugs have what we call 'phenotypic plasticity', which is a fancy way of saying that they can change around their metabolism (and other stuff) by activating alternate (usually) genetic pathways to adapt to their environment. It's like if we could start digesting grass, but only if we were starving in the first place.