Does an earth-like planet have to have Ice Ages?

When you look at the history of earth, the last ice age had major impacts on the flora and fauna of the world as well as biological migration.

If I am creating an earth-like world and am developing a history for it, does that history need to include ice ages? Are they a forgone conclusion in the way earth works?

A follow-on question: if it is realistic that an Ice Age does not occur, how would that impact the flora and fauna of the planet?

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Does an earth-like planet have to have Ice Ages?

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