When Kostas Konstantinidis proved that many bacteria—like plants and animals—are organized into species, he upended a long-held scientific belief. Scientists widely believed that bacteria, due to their unique genetic exchange mechanisms and the vast size of their global populations, did not—and could not—form distinct species. When Kostas Konstantinidis proved that many bacteria—like plants and animals—are organized into species, he upended a long-held scientific belief. Scientists widely believed that bacteria, due to their unique genetic exchange mechanisms and the vast size of their global populations, did not—and could not—form distinct species. Evolution Cell & Microbiology Phys.org – latest science and technology news stories