POSSIBLE POINTS Researchers are studying lichens growing on trees in a forest ecosystem. At the beginning of the study, the
researchers identified twelve lichen species in the forest. Later, a forest fire happened in the study area. The
researchers returned to the area and found only six lichen species. (8.11B)
Which inference is best supported from the researchers' observations?

Martha participates in a research study in order to receive extra credit for her psychology class. when she arrives in the research office she is given a can of what looks and tastes like beer, but which actually contains no alcohol. in the adjoining room martha's classmate karen is also participating in the study. karen receives a can of alcoholic beer. if the experiment was designed to test the effects of alcohol on concentration, then who is exposed to the independent variable?