The Only Time Amphibians Conquered the Oceans

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All animals originated in the sea and then evolved to come out on land, however, throughout prehistory many different groups of these animals have then found there way back into the water readapting certain features. This would include multiple lineages of birds, reptiles and mammals but strangely enough the one group of animals that seems to have struggled with this evolutionary pathway are the amphibians. However, there was one time where the amphibians did take to the sea and adapt into many forms around the world.

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Sources:
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https://pmc.ncbi.nlm.nih.gov/articles...
http://rocek.gli.cas.cz/Postdoc/steye...