Which TERM means that the cell membrane will only let SOME substances
IN/OUT of the cell?

The cell part that allows only certain substances to diffuse into and out of the cell is called the semi permeable membrane.

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.

i hope this : )