Select the correct answer from each drop-down menu. What is the reason the cell membrane is made of phospholipids?
The cell membrane is made of phospholipids to prevent molecules from freely
{blank} and
{blank} the cell.

The options of the first blank is: entering or expanding
And the opinions for the second black are: moving or exiting

Smoking damages the respiratory system by inhalation of a foreign substance, that is absorbed and residue is left behind on our lungs sponge like substance. the gas that is inhaled also increase your blood pressure and dilates your blood vessels. also the process of inhaling and exhaling the smoke it causes irritation to the throat and mouth. smoking can cause lung cancer and other respiratory and circulatory diseases. 

Ithink the answer is c.  hope this is right and