Answer:
Humanistic perspective would be the right choice ig!
In a study, the independent variable is the thing that you change to see how the change produces different results. In this study, the independent variable would be the use of nicotine.
Answer:
There are 2 Valve Systems
Explanation:
The mitral valve and tricuspid valve are located between the atria (upper heart chambers) and the ventricles (lower heart chambers).
Hii! I believe the answers are Sympathetic, Digestion, and Adrenaline. (:
