Why do deserts make good boundaries

The boundaries of the desert are climatic dependent because the annual rainfall is no longer sufficient enough to allow a diffuse plant cover. They can be followed over the whole continent. Even in the climatically favoured region of the Oceanic Sahara in Mauritania these boundaries are clearly identifiable.

Explanation:

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after balancing the chemical equation, what are the coefficients for these compounds?

h2s      

⇒ 3

hno3    

⇒ 2

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answer; the basal forebrain;