Gases does not have definite shapes and volume ? (give a scientific reason for the following)​

Gases do not have a definite shape or volume because the molecules in gases are very loosely packed, they have large intermolecular spaces and hence they move around. ... The particles of solid are closely packed and occupy less space while particles of gases are loosely packed and occupy the complete space available.

Explanation:

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the answer is:  

line graphs show patterns in data with variables that change over time; whereas, circle graphs show data as parts out of a whole (such as out of 100%).

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.