Theory:

1024pxTreeofLivingOrganisms21w1022.png
 
 
 
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Reference:
https://www.flickr.com/photos/121935927@N06/13536385423/in/photostream/
https://upload.wikimedia.org/wikipedia/commons/thumb/b/ba/Tree_of_Living_Organisms_2.png/1024px-Tree_of_Living_Organisms_2.png