1. The amount of heat produced when are gram of the fuel is completely burnt is called calorific value of fuel.

    The amount of heat produced when are gram of the fuel is completely burnt is called calorific value of fuel.

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  2. Migration is the movement of animals and birds in large numbers in search of food and water. They return to their habitat when conditions become favourable.

    Migration is the movement of animals and birds in large numbers in search of food and water. They return to their habitat when conditions become favourable.

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