Final answer:
Animal source foods such as meat, fish, poultry, eggs, milk, and cheese, as well as the plant-based soy, provide all essential amino acids, making them complete proteins. Other plant foods may offer incomplete proteins, which can be combined to ensure a balanced intake of all amino acids. All the options are correct.
Step-by-step explanation:
The foods that supply all the essential amino acids in adequate amounts are primarily from animal sources. These include 1) Meat, 2) Fish, 3) Poultry, 4) Eggs, 5) Milk, and 6) Cheese. Additionally, a plant-based food known as 7) Soy is also capable of providing all essential amino acids, making it a valuable protein source for vegetarians and vegans.
Proteins containing all nine essential amino acids are considered complete proteins. Examples of foods with complete proteins are animal products such as meat, fish, eggs, and dairy products like milk and cheese. On the other hand, many plant foods offer incomplete proteins, which are missing one or more essential amino acids. However, different plant foods can be combined to create complementary proteins, providing all necessary amino acids when eaten together, like beans and rice.