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Which part of alimentary canal of cockroach has an outer layer of thick circular muscles and inner cuticle forming six highly chitinous plates called

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Which part of alimentary canal of cockroach has an outer layer of thick circular muscles and inner cuticle forming six highly chitinous plates called teeth?
A. Gizzard
B. Crop
C. Proventriculus
D. Both A and C
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Gizzard or proventriculus is the part of alimentary canal of cockroach has an outer layer of thick circular muscles and inner cuticle forming six highly chitinous plate called teeth.
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