Which of the blood vessel may be considered as true heart in earthworm?

Dorsal blood vessel

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Ventral blood vessel

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Supra-oesophageal blood vessel

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Anterior loop

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Solution

The correct option is A Dorsal blood vessel
The dorsal blood vessel on the dorsal side of earthworm has thick walls that pump the blood into the aortic arches which are 5 in number.
So, the correct option is 'Dorsal blood vessel'.

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