Create a multimedia presentation examining the significant contributions of the following figures: George Washington, Thomas Jefferson, John Marshall, Andrew Jackson, Abraham Lincoln, Theodore Roosevelt, Franklin D. Roosevelt, and Ronald Reagan. Use text and images to share your information with an audience

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.        

answer; never again fought on union soil;

answer; the difference intentions of each photographer;