You’re heart rate increases, your adrenal gland releases cortisol (a stress hormone), and you receive a boost of adrenaline. This occurs in the alarm stage.
Answer: Independent variable
Explanation:
Independent variable can be defined as the variable that is changed or controlled in the experiment. The independent variable is changed during the experiment in order to see the effect of dependent variable which changes due to change in the independent variable.
Here, the given statement is independent variable in which the no one or other students in room would learn students.
This is independent variable as dependent variable will change based on independent variable.
