A scientist wants to monitor the amount of acid precipitation falling into a watershed.
Which tool would be the best for the scientist to use?
A. Satellite images
B. Bioindicators
C. Dissolved oxygen sensor
D. pH meter

The famous scientist galileo galilei did several experiments with sloping planes, which he rolled metal balls down so that he could study motion. by changing the slope, he could study how the speed at which the ball rolled was affected. what was the independent variable in galileo's experiment? a. the speed of the ball b. the slope of the plane c. whether the ball moved d. what the ball was made of