Nomadic people received income from where

from selling livestock and handicraft such as pottery

Explanation:

- both b and d.

-since b and d are the closest coastlines then that makes it the most affected.

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the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface.