Set points can change over time

Learning vocabulary by connecting a word to words and categories that are already understood is called ______

Fill in the blank with correct word

One explanation for new species is that they emerge when two populations from an original species become geographically separate. With respect to this explanation, contemporary research has shown that

a. geographically isolating a species brings about its extinction. b. it is not possible to geographically isolate members of a species from one another. c. there are many examples of new species that have emerged without geographic isolation. d. new species never have ancestors in common with original species.