A researcher who stands on a street corner recording the gender of the driver of each vehicle, and whether or not the driver comes to a complete stop at the stop sign is engaged in:

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.

Which is the most commonly diagnosed specific phobia?

a) fear of animals b) blood-injection-injury phobia c) situational phobia d) fear of the natural environment