Physics
Solids have definite shapes.This is because

The forces of adhesion are less
The forces of adhesion are large
The forces of cohesion are very large
The forces of cohesion of the molecules within are very much less in them

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Physics
Conservation of energy refers to the fact that

If you conserve energy you will not be as tired
The entropy of the universe is always increasing
Energy cannot be created or destroyed but can be converted from one form to another
No chemical reaction is 100 percent efficient

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