In which federal courts are trials conducted?

Brazilian rubber tappers

a. lost their livelihoods when synthetic rubber was produced. b. have become environmentally active to protect the Amazon. c. plant two new trees for every one they kill by tapping it for rubber. d. have become the greatest force against indigenous rights in the Amazon. e. advocate clear cutting to enable new rubber trees to grow without competition.

External validity is the extent to which the results of a particular experiment can be generalized to the

a. population. b. other settings. c. other times. d. all of the above.