Mud Eel (Siren lacertina) has _______________________.

Five pairs of both external gills and gill slits.

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Four pairs of both external gills and gill slits.

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Three pairs each of both external gills and gill slits.

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Two pairs each of both external gills and gill slits.

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Solution

The correct option is C Three pairs each of both external gills and gill slits.
Mud eel has
$\Rightarrow$ Three pairs each of both external gills and gill slits.
Characteristic of siren lacertina(Mud eel)
They belong to order urodela of class Amphibia
They are generally eel-like in form, with two tiny, but otherwise fully developed, fore limbs
Adults have fully developed gills
They have very small fore limbs and lack hind limbs altogether.

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