What is the role of culture in human adaptation. please give me a precise answer​

Culture is by far our primary method for adapting to the environment today. Culture allowed our ancestors to thrive and spread into new areas. Humans first lived in the tropics and were physically adapted for a warm climate. In fact, in terms of their biology, humans are still tropical animals.

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."