Explanation behind shape shifting

I'm writing a novella for a school competition. My main character is a shape shifter.

I am trying to find a plausible scientific explanation for how shape shifting is possible. I tried finding answers both on google and on here but didn't find what I was looking for.

I did read somewhere that you could use the elements in the air to shapeshift or your DNA could be combined some how with other animals/the thing you want to shape shift to for example my character is limited to growing wings and changing into only 2 animals.

I just want some reasons behind this so that my story isn't completely far fetched and I can't explain it myself since I'm not smart enough

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Explanation behind shape shifting

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