Final answer:
Olive oil is the food group commonly known for providing Omega-9 fatty acids, which are monounsaturated fats. Omega-3 fatty acids, found in fish like salmon and tuna, are polyunsaturated and have different health benefits.
Step-by-step explanation:
The food group commonly provides Omega-9 fatty acids is Olive oil. Omega-9 fatty acids are a type of monounsaturated fats, which can be found in high amounts in nuts and seeds like almonds, pecans, cashews, and peanuts, plant oils such as canola, olive, and peanut oils, and avocados. In contrast, foods like fish, such as salmon, trout, and tuna, are known for being good sources of omega-3 fatty acids, which are polyunsaturated fats that have beneficial effects on heart health and development.