Researchers use all of the following to study the impact of heredity on behavior except studies. a. family b. peer c. adoption d. twin

(b) Peer

Explanation:

The physical attributes, for example, stature, weight, shade of eye and skin, social and scholarly conduct are dictated by heredity. Contrasts in these attributes are because of the adjustment in the qualities transmitted. Brotherly twins additionally contrast from one another, in light of the fact that they are conceived out of various qualities.

Peer has no impact on heredity

So option (b) will be correct option  

what group of people depend on what yoy are talking i will still you once you tell me what group of people you are talking about : )

i think i know what group you are talking about so the brahmins