The blood press sure of a solider is measured when he is resting. The same solidger is then exposed to a stressful environment and his blood pressure is measured again. IDENTIFY the independent. Dependent and constant variable. My question is what is the CONTROL VARIABLE PLZZZ HELP

A variable, which is monitored or changed while performing an experiment in order to examine the influences on the dependent variable is considered as the independent variable. On the other hand, the variable, which is being determined and examined while performing an experiment is known as a dependent variable.  

The dependent variable bank upon the independent variable. As the researcher modifies the independent variable, the influence on the dependent variable is witnessed and noted. In the given case, a soldier is exposed to a stressful environment, which makes a change in his blood pressure.  

It is noted that with the change in the environmental condition, a change is noticed in the blood pressure of the soldier. Thus, in the given case, the stressful environment is an independent variable, and the change in blood pressure is a dependent variable.  

Explanation:

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the element that provides strength to the exoskeletons of clams and oysters is phosphorus. this is so because calcium carbonate is the main component in the shells.

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