Which of these is made in bone marrow? (Select all that apply.) red blood cells
plasma
white blood cells
platelets

red blood cells

platelets  

white blood cells

Explanation:

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."

d

explanation:

it establishes america’s basic laws and fundamentals to its citizens.