What were new immigrants mainly coming from in the late 1800s?

the branch of biology that deals with the normal functions of living organisms and their parts.

the way in which a living organism or bodily part functions.

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; to be the responsible party for healthcare delivery through medicare and medicaid programs;