Which of the following describes an in vitro experiment? O A. Observations are made in a bacterium.
B. Observations are made in a mouse.
C. Observations are made in a plant.
D. Observations are made in a test tube.

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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