Which of the following is an example of an organic substance?

Fats are classified as organic substances because they are primarily composed of carbon, hydrogen, and oxygen atoms, which are fundamental elements found in organic compounds. The characteristic structure of fats includes long hydrocarbon chains or glycerol molecules, which are essential for biological functions. They play key roles in energy storage, cellular structure, and signaling within organisms.

In contrast, minerals, pesticides, and water either do not contain carbon or are inorganic. Minerals are naturally occurring, inorganic substances essential for various biological functions. Pesticides, while they can be organic in a chemical sense, are often classified based on their synthetic or natural origin rather than their organic compound properties. Water is a simple, inorganic molecule consisting of hydrogen and oxygen. Therefore, fats represent a clear example of an organic substance due to their molecular structure and biological importance.