Which is not a characteristic of vitamins? a. they occur naturally in rocks and minerals. b. they are made by living things. c. they assist in many chemical reactions in the body. d. they are required by the body in small amounts

A. They occur naturally in rocks and minerals.

Explanation:

Vitamins are substances that the body cannot produce and therefore need to be part of the diet. Its main sources are places where they occur naturally, such as fruits and vegetables, but they are also found in meat, milk, eggs and cereals. Accordingly, we can say that vitamins do not occur naturally in rocks and minerals, but are made by living things, such as plants.

Vitamins perform various functions in development and organic metabolism and are required by the body in small quantities. However, they are not used as energy or as a cellular replacement material. They work as additives - they are indispensable to the energy-producing mechanism and others, but in small quantities.