You cant settle in deserts due to lack of water and scarcity of food, which led to the Saharan regions being less populated. Hope this helps.
The abiotic parts of an ecosystem are water, soil, air and dead organic matter. The correct options among all the options that are given in the question are the second, fourth, sixth and seventh options. They are basically non-living things that are present in the ecosystem. I hope it helps you.
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The United States has played a special role in the development and support of human rights ideas and practices. The Declaration of Independence, by which the American colonies severed their allegiance to the British Crown in 1776, proclaimed that “all men are created equal.” No less important, the declaration asserted the right of a people to dissolve political bonds that had come to be oppressive.
