James decided to do an experiment with a can of soda. He opened a 340 g can of soda and left it open for a day. The next day, he measured the soda can again and found it was 332 g. Which statement below best explains why the masses were different?
A. The can was open and gases were released.
B. The can was a unopen and gases were released.
C. A mistake was made and the experiment should be conducted again because the Law of Conservation of Mass was violated.
D. A mistake was made in measuring the mass of the can.

Air pressure is measured in pascals. for a professional american football game, the ball should be inflated to about 90,000 pascals. scientists studied the effects of air temperature on the pressure inside american footballs by taking these steps: 1. prepare 100 footballs. 2. measure each football's air pressure. 3. divide footballs into 10 groups. 4. place the groups in different lockers cooled to different air temperatures. 5. after 12 hours, remove the footballs from lockers. 6. measure each football's pressure again. 7. compare the new pressures to the starting pressures. what two terms best describe the variable "air pressure inside the football" in this experiment? independent, qualitative independent, quantitative dependent, qualitative dependent, quantitative