The formation of fertile hybrids in artificial settings is not sufficient evidence to define a species because Blank______.Multiple choice question.it doesn't take into account the effects of gene flowonly a small percentage of individuals can hybridize in artificial settingsit may not occur in a natural setting

When members of populations do not mate with each other or cannot produce fertile offspring, they are Blank______.Multiple choice question.undergoing speciationexperiencing gene flowreproductively isolatedundergoing anagenesis

Which is left unexplained by the biological species concept, thereby weakening the concept?Multiple choice question.The existence of viable, but sterile hybrids (such as the mule)Hybridization in natural settingsHybridization in captivity

If two species that have evolved over time to be completely reproductively isolated suddenly come into contact with one another, they will likely Blank______.Multiple choice question.hybridize, initiating gene flow and homogenizing the gene poolshybridize, forming a third speciesremain distinct species

If biological species are defined in terms of reproductive compatibility, which of the following factors determines the formation of a new species? Group of answer choicesgene flowgene flow expansionhybrid formationreproductive isolation

Organisms may be unable to breed because of physical characteristics, location, habitat, or even differing courtship behaviors; this is called Blank______.Multiple choice question.the evolutionary species conceptthe phylogenetic species conceptreproductive isolation