Which ecosystem is characterized by rainfall under 25 cm/year,hot days,cold nights,and spiny-leafed plants?

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Deserts are usually found at latitudes of about 30F1F1F1S1F1F1F10 in both the Northern and Southern Hemispheres.The winds that descend in these regions lack moisture,and the annual rainfall is less than 25 cm.Days are hot because lack of cloud cover allows the sun's rays to penetrate easily,but nights are cold because heat escapes easily into the atmosphere.

Which Ecosystem Is Characterized by Rainfall Under 25 Cm/year,hot Days,cold