HDI refers to HUMAN DEVELOPMENT INDEX
Explanation:
It is necessary to measure HDI of the countries to see economic development of the country. It value ranges from 0 to 1, the values closer to 0 show loe economic development and values closer to 1 shows high economic development.
Early native Americans adapted to their enviroment by utilizing the things they had, and making do without the things they didn't have. For example, depending on their enviroment, houses were build differently to suit their lifestyle, and they used materials available to them. They also ate what they could find around them.
Yes the I.A.S. did encourage them to do that
Hope I helped!
:D