6. Extinct Organisms
7. Extant Organisms
6.1.1 (under 6.1 Precambrian)/6.2.1 (under 6.2 Paleozoic)/6.3.1 (under 6.3 Mesozoic)/6.4.1 (under 6.4 Cenozoic) Eukarya
6.1.2 (under 6.1 Precambrian)/6.2.2 (under 6.2 Paleozoic)/6.3.2 (under 6.3 Mesozoic)/6.4.2 (under 6.4 Cenozoic) Prokarya
OR
6.1.1-6.1.7 (under 6.1 Precambrian)/6.2.1-6.2.7 (under 6.2 Paleozoic)/6.3.1-6.3.7 (under 6.3 Mesozoic)/6.4.1-6.4.7 (under 6.4 Cenozoic) Bacteria/Archaea/Protozoa/Chromista/Plantae/Fungi/Animalia
7.1-7.5 Animals, Plants, Fungi, Bacteria, Protists 7.1 Eukarya + 7.2 Prokarya
7.1.1-7.1.6 Invertebrates, Fish, Amphibians, Reptiles, Birds, Mammals 7.1.1-7.1.7/7.2.1-7.2.7 Bacteria/Archaea/Protozoa/Chromista/Plantae/Fungi/Animalia
Phyla and Classes (such as Chordata and Mammalia respectively), on second thought, can become sections/categories under the Domains or Kingdoms (Eukarya/Prokarya and Bacteria/Archaea/Protozoa/Chromista/Plantae/Fungi/Animalia respectively)
Individual pages (let's take whales as examples, Genera/Species such as the blue whale/Balaenoptera musculus, and fin whale/Balaenoptera physalus, etc) can be grouped under Orders/Familiae (such as, accordingly, Artiodactyla/Balaenopteridae respectively) which would be given their own pages, with record-holding/notable genera and species being displayed in the Powers And Stats of the new order/family page (such as the blue whale's notable abilities being noted in Powers And Stats of the Artiodactyla/Balaenopteridae page)
(Still a bit complicated to simplify further, this is the best I can do)