In cockroach mouth part consists of a labrum, a pair of mandibles, a pair of maxillae and a labi...

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In cockroach mouth part consists of a labrum, a pair of mandibles, a pair of maxillae and a labium. Labrum and labium act as -
(b) Lower and upper jaws respectively
(a) Upper and lower jaws respectively
(d) Upper and lower lips respectively
(c) Upper jaw and lips respectively
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