This is the observed variable in an experiment or study whose changes are determined by the presence or degree of one or more independent variables. when graphed, this variable is usually on the vertical axis.

dependent variable

Explanation:

A dependent variable is the variable being tested and measured in a scientific experiment.

It is the event studied and expected to change when the independent variable is changed.

the secretary of state, appointed by the president with the advice and consent of the senate, is the president's chief foreign affairs adviser. the secretary carries out the president's foreign policies through the state department and the foreign service of the united states.

d. i assume the underlined word is "role." reformat if it isn't.

explanation:

role is closest to part because when replacing words, "playing a vital decision," "playing a vital activity," and "playing a vital dollar" don't make logical sense. the only meaningful choice is "playing a vital part."

this fits one of merriam-webster's definitions of role: "a function or part performed especially in a particular operation or process."