This is a text explanation of the flowchart found at the bottom of the "Evolution" page of the wiki. The flowchart shows the evolutionary path to get to each species. Read no further if you prefer to figure it out yourself.
The starting point for every species is Phagocytotis.
Phagocytotis branches into four categories: arthropods, eggshells, sexual reproduction and mammals.
Anthropods is a genus that includes the species Mantis, Scorpid and Antid.
Sexual reproduction branches into the genera Chloroplasts and Chitin. Ent and Cacti are the Chloroplast genus, while Sporgar and Shroomi are the Chitin genus.
Eggshells branches into the Ectothermic and Endothermic genera. Endothermic includes Arraak, Pterodacti, and Dracnid, while Ectothermic includes Slitheryn, Gecko and Tortisan.
Mammals branches into the genera Humanoid, Gigantism, Dwarfism and Animalism. Humanoid contains Human, Elf, and Ork. Gigantism contains Ogre, Cyclops and Troll. Dwarfism contains Kobold, Goblin and Gnome. Animalism contains Cath, Wolven and Centaur.
Species in the same genus have the same 2 minor genetic traits. For example, each species in the Dwarfism ("Small") genus have the traits Small and Weak. You can learn more about the races and traits on the wiki.