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Those early ancestors however lacked the internal ovipositors of modern roaches.

The body is divided into a thorax of three segments and a ten-segmented abdomen.Cockroaches are insects of the order Blattodea, which also includes termites.About 30 cockroach species out of 4,600 are associated with human habitats. The cockroaches are an ancient group, dating back at least as far as the Carboniferous period, some 320 million years ago.The structures have been used as inspiration for robotic legs.The abdomen has ten segments, each with a pair of spiracles for respiration.

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