Vitamin A can exist in foods in a variety of forms. Complete each sentence with the correct term.
a. The only source of retinoids, also called .... , are in animal foods, including liver and fish.
b. Plants contain pigments called .... , some of which the body can convert to vitamin A.
c. A pigment that can be converted to vitamin A is called provitamin A.
d. The most potent form of provitamin A is ...., the orange-yellow pigment in carrots and other orange and yellow vegetables and fruits.
e.Other carotenoids include zeaxanthin and ...., which help maintain good eye health.