FOR long we have accepted as well-established and equivalent the five classes of vertebrate animals, but recent zoological ... of the vertebrate phylogenetic tree, most of the branches being ...

Evolutionary trees show how different species have evolved ... So the question is, why? How could an animal be so precisely adapted to a particular lifestyle? The answer is natural selection.

The discovery of a billion-year-old fossil in Scotland offers exciting new insight into animal evolution, BC researcher says Loch Torridon in Scotland, where the microfossil was discovered. Photo: ...