It ensures constitution Does not change?
The indian resevoirs are meant to strictly separate them from the world, they stay secluded and only to themselves
I think it determines your progress at something. It determines on what you can, or need to improve, or possibly change.

Families fell apart when the husbands would leave to go search for jobs.To save money, families neglected medical and dental care. Many familles sought to cope by planting gardens, canning food, buying used bread, and using cardboard and cotton for shoe soles. Despite a steep decline in food prices, many families did without milk or meat.
Marriages were delayed, Divorce &birthrate decreased .

Hope it helps
~<em>ʆᵒŕ∂ཇꜱꜹⱽẻⱮë</em>