The cell membrane is selectively permeable. Which type of membrane protein best illustrates this concept? A. channel
B. marker
C. receptor
D. hormone

marker.

Explanation:

selectively permeable means some materials are allowed in and out of the cell.

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 : )

sex cells are usually half's then they find another half and make a fertilize egg