The world wide web is the name given to the worid-wide system of computer networks that are connected together and that exchange data through wires, cables, and wireless connections. true or false

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."

answer; in the 1950s;

i do not know the question, but all of the above are correct; ///good luck;