Physics
A system exhibiting S.H.M. must possess

Elasticity only
Inertia only
Elasticity as well as inertia
Elasticity, inertia and an external force

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Physics
Solids have definite shapes.This is because

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

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