In reptiles such as adult Vipera.

Mesodermal scales and scutes are present that are shed as skin cast

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Four chambered heart is present

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Are tetrapods and have glandular skin

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External ear opening is absent

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Solution

The correct option is A External ear opening is absent
In reptiles scales and scutes are of epidermal origin ,and they have three chambered heart and they also belongs to tetrapods but don't have glandular skin whereas external ear opening is absent.

So, the correct option is d.

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