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B
Respiratory organs
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C
Chemoreceptors
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D
Digestive organs
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Solution
The correct option is B Chemoreceptors Many flatworms have auricles. Auricles consist of angled projections from the sides of the head. Auricles contain concentrations of nerve cells. These nerves are sensitive to both touch, moisture and certain chemicals. The auricles are the principal organs of chemoreception.