Final answer:
Leukonychia nails have a thin, white nail plate and are more flexible. The free edge of a nail is made of keratin.
Explanation:
Leukonychia is the type of nail that has a noticeably thin, white nail plate and is more flexible than a normal nail. The free edge of a nail is the part that extends past the finger, beyond the nail plate, composed of keratin. It's the hard and translucent portion of the nail.
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