Answer:
known as the mantle. Earth is divided into three layers: the crust or the outermost layer on which we live; the underlying, middle layer - the mantle - and the core
Explanation:
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The "driest" area of Midwest region would most likely:

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Shed their leaves during one season
Penguins is the simple subject of the sentence because the sentence is about penguins.
Well, they use mainly use the beak, but besides that, I'd say their feet and talons.