Physics
Which of the following laws validates the statement that matter can neither be created nor destroyed ?

Law of conservation of energy
Law of conservation of mass
Le Chatelier's Principle
Law of osmosis

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Physics
It is easier for a man to swim in sea water, than in river water because

The sea is wider than the river
The sea is-deeper than the river
The density of sea water is more than the density of river water
The density of sea water is lesser than the density of river water

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