What runtime is needed to remove an element at the bottom of a stack with n elements and return the stack with all of the other elements in their original order?.

the answer is barium and copper bromide

warm front forms when a moist, warm air mass slides up and over a cold air mass. as the warm air mass rises, it condenses into a broad area of clouds. a warm front brings gentle rain or light snow, followed by warmer, milder weather.

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