Which of the following is the flow of electrons through a wire or a conductor

Electric current.

Explanation:

Hello,

Electric current is defined to exist when there is a net flow of electric charge through a space, in this case the wire (circuits) or the conductor material. Remember that its SI units are the amperes (A) as well as it is measured using the ammeter

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gravity causes stares to cluster i think so

a rain shadow is a dry region of land on the side that is protected against the prevailing winds of a mountain range. the prevailing winds are the winds that occur most of the time in a particular place of the earth

prevailing winds carry air toward the mountain range. as the air rises up over a mountain range, the air cools, water vapor condenses, and clouds form. on this side of the mountains, called the windward side, precipitation falls in the form of  rain  or snow. this dry air produces a  rain shadow.