The law of conservation of mass states that in any closed system the mass of the system is neither created nor destroyed over time i.e, the mass cannot be changed overtime.

Hence, the given statement is true.

At any given speed, momentum is directly proportional to mass of an object.

The Maharana Mewar Award is a Rajasthan State Award.

This award has been instituted to honour work of permanent value to those who consider it their duty, like the Diwan of Shri Eklingji still do, to benefit society through services in the field of education, literature, social services, philanthropy and character building activities.

A living community and its environment is what an ecosystem is.