The steel plow was invented by john deere. it was an improvement over the older iron or wooden plows that were being used at the time. why was the steel plow important in the development of the west?

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."

the works of justice saves things/people

the works of service things/people

explanation:

that's the best i can word it. hope it !