Athens and Sparta were both important city-states in ancient Greece. They shared the same and . But life was very different in Athens than it was in Sparta. * Your answer
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answer; ///it examines the interaction between genetics and culture in shaping human biology;

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."