Two populations of the same species can become ____ isolated from each other. Two populations will become separate species when they can no longer interbreed to produce ____ offspring. A species evolves through ____ as only the genes for advantageous characteristics are passed to offspring. ____ are different versions of the same gene. Two populations could be separated either side of a ____ range. ____ is the process in which a single species evolves to become two separate species. Darwin saw differences in the shape of finch ____ on the different islands of the Galapagos. Two closely related species will share the same ____ ancestor. Humans share their most recent common ancestor with ____. The first organism to appear on the planet was a ____.

9-1 Speciation FT

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