Sentence:  It is likely that the long <WSD>evolutionary</WSD> trajectory of "Mycoplasma" went from a reductive autotroph to oxidative heterotroph to a cell-wall–defective degenerate parasite. This <WSD>evolutionary</WSD> trajectory assumes the simplicity to complexity route of biogenesis, a point of view that is not universally accepted. 
Meaning of the word marked with <WSD> tags:  Of or relating to the biological theory of evolution.