Question

more experimental design practice
the blood pressure of a soldier is measured while he is resting. the soldier is then exposed to a stressful environment and his blood pressure is measured again.
the independent variable is
the dependent variable is

Explanation:

The independent variable is the factor manipulated in the experiment. Here, the soldier is exposed to a stressful environment (a change from resting), so this is the independent variable. The dependent variable is the outcome measured, which is blood pressure (it depends on the environment).

Answer:

The independent variable is: exposure to a stressful environment
The dependent variable is: blood pressure