Question

define ethnic compostion

Answer 1

Membership of an ethnic group tends to be defined by a shared cultural heritage, ancestry, origin myth, history, homeland, language or dialect, symbolic systems such as religion, mythology and ritual, cuisine, dressing style, art, and physical appearance.

Answer 2

hola amigo

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ethnic composition:

these are differences which are based on shared culture or tradition.

for example,
The Irish and Scottish groups
  { if you are having a different chapter please use example from that}

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hope it helps :)