What was the science that backed up milankovitch

The Milankovitch theory postulates that Earth's orbital cycles contribute to similar periodicity in climatic variation — with the periods of the climatic cycles primarily ranging from 19,000 years to 1,200,000 years.

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Please give brainliest!

i believe that it is a exoplanet

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a