It is said that if the earth is destroyed in nuclear war, then all the creatures of the world will be wiped out; This does not mean that the cockroach is immortal. Rather, this idea has come because the cockroach may survive in very hostile environment. They can live for about a week without water and can survive for almost one month without any food. Even if the head of the cockroach is cut off from their body, they can quickly stop the hole in the cut area and breathe through breathing through various parts of the body.
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From @talkativechaplin