For vision, ___ must be converted to _____ in the cells of the retina.

For vision, ___ must be converted to _____ in the cells of the retina.

A. vitamin C, retinal

B. vitamin E, biotin

C. vitamin A, retinal

D. vitamin A, biotin

Answer: C

Explanation:

Vitamin A is a precursor of retinal, which is the chemical compound that enables animals to see. Biotin is associated with vitamin B. Carrots are known to be good for vision because they are high in vitamin A.

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