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It might be a bad idea to digest plastics. If they get broken down in the gut, they'll release all those plasticisers and things into the body.

Evolution would figure that out over time with trial and error. We could instead get mammals with plastic nails/claws/hooves instead of keratin

e.g. keratin and cellulose are structural polymers not too different from materials like PET.

Can somebody do the napkin math on an estimate for how long for us to get plasticized hair and nails and teeth?