Source: http://en.wikipedia.org/wiki/Timeline_of_human_evolution
The Sarcopterygii (http://en.wikipedia.org/wiki/Sarcopterygii) is a class of fish which grew limbs and evolved into amphibians
The Tiktaalik (http://en.wikipedia.org/wiki/Tiktaalik) is an intermediate form between Fish and amphibians
Descendants of the Amphibians later evolved into Aminotes (http://en.wikipedia.org/wiki/Amniote) which split up into Synapids(mammals) and Sauropsids(reptiles and birds)
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