Which statement is true about levels of organization in organisms a. Organ systems function alone.
b. organs cannot be found in plants
c. tissues are found in single-celled organisms.
d. Cells perform location-related functions in the body

fir trees are found in areas with cooler climates. fir trees have needles for leaves and remain green year-round.

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."