Right systematic arch is absent in:

Mammals

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Reptiles

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Amphibians

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Birds

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Solution

The correct option is A Mammals
In reptiles and amphibians both the arches are present (left and right).
Birds have only right arc present in their adult form.
Mammals have only the left arch present in their adult form.
The systematic arch in the adult organisms transports blood to all the body parts except the head.
So the correct answer is option A- 'Mammals'.

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