Answer :
Final answer:
The main ethnic groups in Oceania are diverse and shaped by historical migration and physical geography.
Explanation:
The main ethnic groups in Oceania consist of indigenous peoples, descendants of more recent arrivals from Asia, and those of European ancestry. This diversity is attributed to historical migration patterns and settlement. Physical geography, including land bridges and sea crossings, played a role in shaping the population composition.
Learn more about population diversity in Oceania here:
https://brainly.com/question/2499543
