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Long before animals with limbs (tetrapods) came onto the scene about 365 million years ago, fish already possessed the genes associated with helping to grow hands and feet (autopods) report University of Chicago researchers.
Ancient earth was marked by early mass extinctions that had increased sea levels when they happened in the Devonian period.
Read more about How fish evolved to walk - and in one case, turned into humans on Devdiscourse
![Giant Fish Preyed on Human Ancestors Discovered in South Africa [Study] - Vimarsana News](https://1471793142.rsc.cdn77.org/data/thumbs/full/64195/820/0/0/0/giant-prehistoric-fish.jpg)
A giant prehistoric fish, which likely ate our human ancestors in an ancient supercontinent, was found under a road. Click to read more.
Some fish species pull themselves forward using well developed fore-fins, while others “walk” along the ocean floor.