Why are dark green vegetables such as kale and spinach good sources of vitamin A?
A) They contain abundant beta-carotene, a precursor of retinol.
B) They contain the most abundant preformed vitamin A.
C) They contain vitamin C precursors of retinol.
D) They are fortified with vitamin A.
Question 2
A group of fat-soluble plant pigments that are the basis for the orange, red, and deep-yellow
colors of many fruits and vegetables are called
A) prooxidants. B) carotenoids. C) provitamins. D) chlorophylls.
What makes tea so good
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Estimates of the dates of origin and extinction of the three main groups of hominins (green, blue, a
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