The treatment/enhancement distinction presupposes a theory of species-typical functioning, but 'normal' growth hormone levels exist on a continuous biological spectrum without a principled cutoff point.

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Continuous biological spectrum(as used in biology and bioethics): A range of biological traits that blend smoothly into each other without clear boundaries, like height or skin color—there's no exact point where 'short' becomes 'tall.'
Presupposes(as describing what Plantinga's argument takes for granted): Assumes something to be true without proving it—like how an argument might presuppose that logic works, without first arguing that logic is valid.
Principled cutoff point(as used in philosophy and logic): A clear, logical place to draw a line between two categories—like if you could say 'anything below this number is definitely low, anything above is definitely normal.' Without one, the boundary becomes fuzzy and arbitrary.
Species-typical functioning(as Daniels's definition of what health care should aim to restore): The ability to do the things that are normal or expected for human beings—like walking, thinking, working, and socializing—without major physical or mental limitations.

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