What are periodic and non-periodic changes ?

Periodic change is the change which repeats itself after a fixed interval of time.For eg : heart beat.Non-periodic changes are the changes that do not repeat themselves after a fixed interval of time. For eg : tornado, volcanic eruption, tsunami, forest fires, etc.
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Does periodic and non-periodic changes have relation?

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Changes that are repeated at regular intervals of time are called preod8c change
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