Frogs, like butterflies and salamanders, have what is called a "bi-phasic life cycle." They undergo metamorphosis to grow from their larval stage, as a non-reproductive tadpole that swims underwater, ...
Scientists have discovered the fossil remains of the world's oldest tadpole. It was found in the South American country of Argentina and dates back around 160 million years ago, to the Jurassic period ...
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