Unlike many other kinds of scientists, sociologists do most of their research in the real world, not in a .

Unlike many other kinds of scientists, sociologists do most of the research in the real world, not in a laboratory.  

Explanation:

This is simply because sociologists study human behavior, meaning they work with actual people.   :)

the answer to your question is,

old stone age.

-mabel < 3

answer; can each be concretely realized in different ways;