An index:

a. combines two or more metrics into a single indicator
b. is complex to define, usually involves a calculation and is often in the form of a ratio
c. is easily defined with no calculations and with simple dimensions
d. is any quantitative output of an activity or process

the answer to your question is,

old stone age.

-mabel < 3

answer; procedural justice;

answer; beware of exaggerated claims without supporting evidence;

answer; becoming friends with her roommate and joining the debate team; sarah's making friends with her roommate and joining the debate team are examples of relational needs