Our first four-legged land ancestor came out of the sea some 350 million years ago. Watching a lungfish, our closest living fish relative, crawl on its four pointed fins gives us an idea of what the
Fuente : http://feeds.sciencedaily.com/~r/sciencedaily/~3/i...
Fuente : http://feeds.sciencedaily.com/~r/sciencedaily/~3/i...