Biologists think that speciation generally occurs when: (i) mutation leads to genetic divergence between the two populations, (ii) a barrier prevents gene flow between two populations of the same species, (iii) pre-zygotic or post-zygotic isolating barriers evolve, (iv) selection or genetic drift leads to genetic differences among the two populations.

The answer is: a barrier prevents gene flow between two populations of the same species.

hi, natural selection of the peppered moth during the industrial revolution in 19th-century england is an example of an outlier in the study of evolution. during this time, pollution from factories filled the forests, coating trees in a layer of soot—turning white trees black

mark as brainlest

gokuson

im not in connections yet but i might can you some questions. what grade are you in?