Question

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Answer 1

Answer:

All changes in the world are one of the two types

Explanation:

A change which can happen backward, that is, can be reversed is called a reversible change.

A change which cannot happen backward, that is, it cannot be reversed is called an irreversible change.

Those changes which are desired to occur that is, we want them to take place are known as desirable changes.

Examples: ripening of fruits, germination of seeds etc.

Those changes which we do not want to take place are called undesirable changes.