Answer:
A. the jar covers
Explanation:
An independent variable is what you, as the scientist, changes.
<span>Atmospheric Pressure</span>
The gas flows from higher concentration/pressure to lower concentration/pressure, which is outside the ball.
Answer:
B
Explanation:
Behaviour therapy was popularized by the U.S. psychologist B.F. Skinner, who worked with mental patients in a Massachusetts state hospital.
