Pick the word that best completes the following sentence. A mixture is a mixture in which the composition is
uniform throughout the mixture.

answer; ///i believe that the correct answer is because the house and senate frequently pass different versions of the same bill;

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; scientific;

answer; vygtosky's theory;