Which of the following is/are undesirable changes?

Rusting

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Ripening of fruit

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Deforestation

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Cooking of food

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Solution

The correct options are
A Rusting
C Deforestation
Rusting and deforestation are undesirable changes. They are not useful and harmful to our environment. Ripening of fruit and cooking of food are desirable changes.

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Mention the changes that are always, desirable, undesirable and periodic.

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