What is the phylogeny of all living organisms?
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The above image is a gross overview of the development and branchings of the various pylae.
You will notice that the single line marked 'animals' include every animal that ever were, mollusks, insects, dinosaurs, birds and people. Part of the reason for that is that it is rather difficult to know just what species were present at the 'branching points', and also hard to determine just how they should be grouped.
Some 50 years ago we thought that first warmblooded animals slit off from the reptiles (dinosaurs) and then those warmblooded animals split into birds and mammals. Today we are better able to do biological comparisons at the molecular level, and the classifications have changed to where numerous dinosaurs are recognized as 'warm blooded' and birds and mammals both started out as varieties of dinosaurs.
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