Katherine is a researcher who is interested in examining the effect of caffeine on driving performance. in order to rule out a change in behavior brought about because of participants' expectations about the effect of caffeine, she should use a(n)

97 points what types of changes have been made in the united states to protect people from earthquakes? a. communities are no longer located along fault lines. b. building codes ensure that structures can withstand shaking. c. warnings go off when an earthquake is expected, and people evacuate the area. d. barriers have been built to prevent flooding by a tsunami.

There are 25 elements found in living things. how many of these elements are found in some organisms but not all? 1 , 6 , 19 , 25

Researchers have found that it takes to view a mental image that is larger or covers more distance than a smaller or more compact one.