Scholars classify Indians based on differences in which of the following?

Scholars classify Indigenous peoples primarily based on their language, culture, and physical differences because these elements provide significant insight into the diverse groups within the Native American population. Language is a crucial indicator of cultural identity and can reflect historical connections between different tribes. Cultural elements, including traditions, customs, and social practices, further highlight the unique ways of life that have developed over time among various Indigenous groups. Physical differences, while less commonly emphasized, can sometimes reflect historical migrations and adaptations to different environments.

This classification approach allows for a comprehensive understanding of the complexities and variances among tribes, thereby recognizing the rich tapestry of Indigenous identities across North America. Other classifications might focus on different aspects, such as religion or geography, but they do not capture the comprehensive scope provided by considering language, culture, and physical attributes.