The process whereby organisms better adapted to their environment

a.indigo and cochineal

b.animal hides

c.silver and gold

e.cacao beans and sugarcane

states grant a variety of local governments power to meet residents’ needs (source: apex learning). hope this !

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."