Before this period 390 million years ago, fish were the only vertebrates. Fossils 375 million years old could have shown the inter-linking forms. The fossil Tiktaalik Roseae (seen on the next page) informed us about how the vertebrate amphibian came to be. It was a wonder how the lobe-finned fish came to be the amphibian. The Tiktaalik had sturdy ribs which allowed respiration and sturdy bones which were in place of the tiny bones of fish but placed in similar positions. It was adapted to live on land and swim in shallow waters. The legs constituted the leg and fin respectively. Tiktaalik could breathe atmospheric air while in shallow water but biologists found that it was not ready yet to survive on land.
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