Now that we know a mouse can pass down information about a scent it seems trivial to understand how an insect as adept at epigenetic change as the monarch might pass down information needed for its migration patterns. It becomes easy to explain how they even direct morphological changes to specific generations. They can probably use temperature to direct the epigenetic markers that tells each generation how big its wings need to be and by controlling reactions to scent and other stimulus they can probably tell them where to fly.
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