How did navigational technology help later european explorers

During the Age of Exploration many tools were needed to help it flourish. These tools were helpful mainly because they helped explorers travel across seas. The explorers were able to make their discoveries mainly because of these technological innovations.

Explanation:

the values of the selma marchers was to bring   their ability to vote into law. mlk was not hat march, which was protesting toward lbj

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."