How is an ecological footprint determined

How did the movement of soldiers during world war 1 contribute to the global influenza (flu) pandemic of 1918 to 1919, which killed millions of people

Why the moon is not visible from earth during the new moon ?

The distance a car travels between the time the driver decides to stop the car and the time the driver puts on brakes is called the reaction distance. how does the reaction distance change with speed? a. reaction distance decreases with with speed b. reaction distance stays the same with speed c. reaction distance increases with speed. d. there is not enough information to answer the question