Today, living standards in the richest part of the world are about 50 times higher than living standards in the poorest parts of the world. about the same as living standards in the poorest parts of the world. expected to double every 10 years. about five times higher than living standards in the poorest parts of the world.

Option D, about five times higher than living standards in the poorest parts of the world.

Explanation:

The average per day income of poor people in less than one dollar while in the case of rich people the per day income is too high but yet the living condition is not much varying. Life style of rich people would be 2 to 5 times higher than the life style of the poor people across the world.

Hence, option D is correct

explanation:

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  b.

there are isolated pockets of farming, generally around rivers and oases, which are used for irrigation.