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2015-10-13T19:12:47+05:30

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1)chamges in season....i.e winter,summer,monsoon...
2)Occurence of day and night...
3)Heart beating
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please mark it as brainliest...please please please
2015-10-13T21:39:31+05:30

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
If the season changes heart beat increases an the day and night formation.non periodic changes are :
tonado
volcanic erruptions
forest fires and by means of natural disasters
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