Final answer:
Active vitamin A comes from animal sources, primarily liver and dairy products, while beta-carotene, a precursor to vitamin A, is found in orange vegetables like carrots and sweet potatoes.
Step-by-step explanation:
Active vitamin A is present in foods of animal origin. The richest sources of vitamin A are liver and dairy products. Certain cereals have been fortified with vitamin A to provide additional nutrients. Beta-carotene, a potent precursor to vitamin A, is found in orange vegetables like carrots and sweet potatoes, and is added to some foods for color and nutritional value. It's crucial for maintaining healthy skin, bones, teeth, and vision, especially night vision. Your body is capable of synthesizing vitamin A from beta-carotene, which is also absorbed during digestion.