Earthworm contains blood pigment, known as

Haemoglobin

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Haemocyanin

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Haematin

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Melanin

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Solution

The correct option is A Haemoglobin
In earthworms, the blood vascular system is of closed type. The blood of earthworm is red and haemoglobin is found dissolved in the blood plasma. RBCs are absent in them. The aortic arches, dorsal blood vessels, and ventral blood vessels are three major blood vessel for circulation of blood. So, the correct answer is option A.

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