The biological species concept in all its passionate glory! In taxonomy, one of the key definitions of separate species is reproductive isolation—if two populations can't produce viable offspring together, they're different species. The meme perfectly captures those heated taxonomic debates where biologists emphatically declare species boundaries with the same energy as someone denying an affair. "Did those populations interbreed?" "ABSOLUTELY NOT!" Next time you're at a biology conference, watch taxonomists defend their classifications with this exact intensity.
Viable Offspring Is A Requirement

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