Tuesday, March 20, 2012

Bird - Dino debate | JWnews II

There’s been a long discussion about whether Archaeopteryx came from earlier, tree-dwelling animals that could glide downwards – a hypothesis known as the "trees-down” model. Alternatively, Archaeopteryx may have lived on the ground where it ran quickly and made long leaps, launching itself into flight in what’s called the "ground-up” model.


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