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B
Erythrocruorin
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C
Haemocyanin
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D
Erythrocytes are absent
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Solution
The correct option is A Haemoglobin Pheretima exhibits a closed type of blood vascular system, consisting of blood vessels, capillaries and heart. Blood glands are present on the 4th, 5th and 6th segments. They produce cells and haemoglobin which is dissolved in blood plasma. Blood cells are phagocytic in nature.