Anchor: So, how lucky was the evolutionary leap from prokaryotes (non-nucleated microbes) to eukaryotes (nucleated, and using oxygen)?
Entailed: Evolution moved from prokaryotes to eukaryotes, which are organisms that use oxygen.
Contradiction: In evolution, the eukaryotes came before the prokaryotes.
Contradiction: No final ruling is in existence as of yet.
Contradiction: A bird flying over.
Contradiction: The building is painted gray.
Contradiction: People are sitting.