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(D) In cockroaches,both males and females possess a pair of jointed filamentous structures called $Anal \ cerci$ arising from the $10^{th}$ segment. H

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Anal styles

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(D) In cockroaches,both males and females possess a pair of jointed filamentous structures called $Anal \ cerci$ arising from the $10^{th}$ segment. However,males possess an additional pair of short,thread-like anal styles arising from the $9^{th}$ sternum. These $Anal \ styles$ are absent in females. Therefore,the presence of $Anal \ styles$ is the characteristic feature that distinguishes male cockroaches from females.

The characteristic feature that distinguishes between male and female cockroaches is .........

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