The ancestors of modern day frogs and salamanders are

Jawless fish

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Coelocanth

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Icthyophis

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Amphioxus

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Solution

The correct option is C Coelocanth
Evolution brings gradual morphological changes.
The discovery of Coelacanth (lobe fins), first amphibians is significant as they prove that amphibians have evolved from fish-like organisms.
Lobe fish were the ancestors of modern-day frogs and salamanders.
Thus, the correct answer is option B.

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The ancentors of modern day Frogs and salamanders are

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