Explain why liquids and gases differ in density and ability to be compressed ?

Well, liquids are denser than gasses because gasses are NOT contained in on place. Liquids can also be compresses if it is lightly. Gasses can not be compresses unless you reverse that state that it is in to a solid or liquid.

the answer to your question is c.

if you read the house of usher you should know that the house was haunted

the positions which points up in upward carbon and down in downward carbon are axial

and vice versa holds true for equatorial positions

so the correct answer with labelled diagram will be