Cockroaches
Cockroaches are notorious for what they do. They don't fight back like wasp, spiders, and many others can. The roach has it's advantages though and that's the ability to reproduce at high rates. They're known to adapt quickly also. Many have their homes treated with chemical, and if the roach doesn't die it gets immune to it quickly, making it harder to kill. They come in many sizes and colors. One thing is for sure, and that is they are persistent and though they don't fight back, they're determined.
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