An example of a need is
An example of a want is
If the price of a need goes up, people tend to buy
If the price of a want goes up, people tend to buy

At very high pressures, gases become and will eventually a) more dense; become hotter b) more dense; change to a liquid or solid c) less dense; combust d) less dense; turn into a liquid

Gas cloud 1 is likely to form a star. gas cloud 2 is not. based on this information, match the given conditions with each cloud

The pressure proportional to the area a- inversely b- directly c- increase d-decrease