(B) The provided figure shows the internal anatomy of a cockroach (an insect). The structure labeled '$X$' is the dorsal blood vessel,which is a chara

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(B) The provided figure shows the internal anatomy of a cockroach (an insect). The structure labeled '$X$' is the dorsal blood vessel,which is a characteristic feature of the open circulatory system in insects. It runs along the dorsal side of the body and is associated with the heart chambers.