1. It was thought that evolution took a linear path, so when creatures evolve into another new creatures it would be with limited divergent. Also, there was a thought attached that humans are the highest evolved, or rather, have have gone through the most evolution process has been defunct too. We ain't that great ;] As for the "iconography" it comes from A.O. Lovejoy's The Great Chain of Living.
2. Trees imply so much hierarchy(like the highest thing of the ground is the best-- like god) but illustrate adequately the format that is needed to display phylogenies. Perhaps roots of trees would make a better structure.
2b.
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