What are the functions of an artery, arteriole, vein, venule, and capillary?2.From outermost to innermost, what are the three tunics (layers) of an arte

he movement of air through earth's or any planet's atmosphere is called wind, and the main cause of earth's winds is uneven heating by the sun. this uneven heating causes changes of atmospheric pressure, and winds blow from regions with high pressure to those with low pressure.

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