Words similar to ever-contentious

Example sentences for: ever-contentious

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But even though recent years have seen the publication of symposia on speciation and books on the ever-contentious issue of species concepts, it has been 23 years since Verne Grant's authoritative Plant Speciation [1] and 41 years since Ernst Mayr's magisterial and highly influential Animal Species and Evolution [2]—the last syntheses of research on speciation.