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Subject :NSO    Class : Class 6

Some changes are listed as follows:
I. Changing of seasons
II. Rusting of iron
III. Occurrence of floods
IV. Preservation of food items
V. Formation of butter from milk
Which of these are undesirable changes?

AI and III only
BII and III only
CI, III and V only
DIV and V only

how can changing of seasons be a desirable change

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