Here's why:

* Saturated fatty acids have single carbon-to-carbon bonds. This means that each carbon atom in the fatty acid chain is bonded to the maximum number of hydrogen atoms possible. This results in a straight, relatively rigid structure.

* Unsaturated fatty acids, on the other hand, have double or triple carbon-to-carbon bonds. These bonds create kinks in the fatty acid chain, making them less rigid and more fluid.

Examples of saturated fatty acids:

* Stearic acid (found in animal fats and vegetable oils)

* Palmitic acid (found in palm oil and other plant oils)

* Lauric acid (found in coconut oil and palm kernel oil)

Let me know if you have any other questions!