Sentence:  11.2 Demonstrating the Status of Long-Lived <WSD>Asexuals</WSD> / [...] Indeed, if sex has so many advantages, then which special adaptations - if any - allow long-term survival without it? However, the main task of the research teams dealing with such putative ancient <WSD>asexuals</WSD> has thus far been to demonstrate that their respective groups (mainly bdelloids, darwinulids and certain lineages within orbatid mites) indeed merit the status. 
Meaning of the word marked with <WSD> tags:  A species which reproduces by asexual rather than sexual reproduction, or a member of such a species.