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Digestive juices were collected from three different regions of the alimentary canal. Drops of these juices were added to wells made in an agar of starch as shown below.


After an hour, the wells were rinsed with distilled water and flooded with iodine solution. The results are shown below.

Which of the following correctly identifies the regions of the alimentary canal from which the three digestive juices were obtained?

A
B
C
D


j

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