You have pure breeding lines of lizards.  One pure breeding line has very long tails and the other pure breeding line has very short tails.  When you cross lizards from the two lines you get an F1 generation where all the lizards have intermediate length tails.  When you cross F1 individuals to one another you get an F2 generation where there is a wide range of tail lengths with intermediate lengths are the most common.  Your result is consistent with which of the following modes of inheritance

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