Examlex
For which of the following elements would be wrong to call the oxide "amphoteric"?
Pupil
The pupil is the adjustable opening in the center of the iris of the eye, through which light enters and is focused on the retina.
Iris
The colored ring of muscle around the pupil of the eye, responsible for controlling the size of the pupil and thus the amount of light reaching the retina.
Vitreous Humour
A clear, gel-like substance that fills the space between the lens and the retina in the eyeball, helping to maintain its shape and optical properties.
Cornea
The transparent front part of the eye that covers the iris, pupil, and anterior chamber, contributing to the eye's ability to focus.
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