In which of the following animal only one single median nostril is present?

Salamander

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Petromyzon

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Labeo

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Rana

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Solution

The correct option is C Petromyzon
Petromyzon or Lamprey is an example of jawless fish belonging to class- Cyclostomata. They have one nostril on the top of their head.
Salamander, Lobeo and Rana have 2 nostrils.
So, the correct option is 'Petromyzon'.

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