Era B.

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Era B.
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Completísimo mural de la evolución. Genial!!! (en pdf fraccionado en el enlace)

Phylogenetic Tree of Life -The OpenLearn site used to offer this phylogenetic chart in the shape of a tree as a free poster, but no more. They do have an online version of this same illustration, expandable and with links and an explanatory guide.

Paleozoic Mesozoic Cenozoic

Rock Layers: Timeline of Life on EarthEvolution is a complicated subject. While everybody understands that black bears are related to grizzly bears and we can even figure they are related to extinct bears, lots of people wonder how scientists can be so su