8. What natural disasters possibly caused the people of the Indus Valley to begin to abandon their cities?
A. disease and famine
C. hurricanes and wildfires
B. earthquakes and floods D. volcanoes and monsoons

How did european immigrants of the late 1800s change american society

When children heard an interesting story about a sympathetic and resourceful african-american child, the aim was to provide them with?

In e. c. tolman's experiment, some rats were trained to run through mazes for standard food goals, while other rats were allowed to explore the mazes for 10 days without food goals or other rewards. later, when food rewards were placed in a box at the far end of the maze, the previously unrewarded rats reached the food box as quickly as the rewarded rats after only one or two trials. this experiment demonstrated that the rats had the ability to form of their surroundings.