Final answer:
Fish, such as salmon, trout, and tuna, are rich sources of omega-3 fatty acids, which are important for brain function, growth and development, and heart health.
Step-by-step explanation:
Among the options provided, fish contains omega-3 fatty acids. Omega-3s are a type of polyunsaturated fat essential to our health. They are found in high concentrations in cold-water fish such as salmon, trout, and tuna. These fatty acids play a critical role in brain function and are crucial in the development and growth of the body. Additionally, they contribute to heart health by reducing the risk of heart attacks, lowering blood pressure, and reducing triglycerides in the blood. It's beneficial to include omega-3 rich foods in your diet as they also help prevent inflammation and may reduce the risk of cancer.
On the other hand, foods such as water, hot dog, and popcorn do not contain omega-3 fatty acids. While these items may be part of a regular diet, they do not provide the same health benefits as omega-3-rich foods.