Which part of your fingernail should be trimmed at least once a week?
a. the cuticle,
b. the free edge,
c. the nail matrix,
d. the lunula.

b. the free edge,

Explanation:

The free edge is the white part that is the farest from the place where the nail is born, the citicle is the skinny part that connects the finger and is above the nail, the lunula is the little white semi-circle above of the cuticule, the nail matrix is where the nail is born, and the free edge is the the part that is actually safe to cut and is actually recommended to do so.

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on my last