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Aortic arches are absent in earth worm .
aortic arches is another term for heart, and an earthworm has 5.
There are 5 aortic arches, they are "hearts". They pump blood around the worm and help digestion.
The function of an earthworm's aortic arches are to pump blood to the ventral blood vessel and into the body.
They are responsible for holding up the aortic feet.