Solution:

• The main tribes living on Andaman and Nicobar Islands are the Great Andamanese, Onges, Jarawas, Sentinelene, Nicobarese and Shompens. They belongs to the Negroids human race.
• The indigenous tribes of the Andaman and Nicobar Islands, such as the Great Andamanese, Onge, Jarawa, and Sentinalese, have been historically classified as belonging to the Negrito racial group.
• They possess distinct physical features, including dark skin, curly hair, and broad noses, which are characteristic of Negroid populations.