The cell membrane functions most like a(n) A.) security guard
B.) brick wall
C.) painter
D.) delivery truck

It's A, a security guard

Explanation:

The cell membrane is like a security guard because it controls what goes in and out of the cell.

d. the weight of the book

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 : )