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(A) The cockroach $(Periplaneta 	ext{ } americana)$ possesses an open type of circulatory system, not a closed one. In an open circulatory system, th

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Blood vascular system - closed

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(A) The cockroach $(Periplaneta 	ext{ } americana)$ possesses an open type of circulatory system, not a closed one. In an open circulatory system, the blood (hemolymph) flows into body cavities called sinuses. Therefore, the statement 'Blood vascular system - closed' is incorrect. The other options are correct: the respiratory system consists of a network of trachea, the head is triangular in shape, and the eyes are compound.

Choose the incorrect statement regarding the characteristics of a cockroach.

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