Animal flesh is considered a good source of high quality proteins because animal proteins provide the right proportion of amino acids needed by humans.

Option 1, which states that animal proteins are directly taken up by muscle tissues and add to their strength, is incorrect. While it is true that animal proteins contribute to muscle growth and strength, this option oversimplifies the process. Proteins from animal flesh are broken down into amino acids during digestion, which are then absorbed by the body and used for various functions, including muscle repair and growth.

Option 2, which states that animal proteins have all amino acids, is partially correct. Animal proteins are considered complete proteins because they contain all the essential amino acids that the body cannot produce on its own. However, this option does not explain why animal proteins are a good source of high-quality proteins.

Option 3, the correct answer, explains that animal proteins carry the right proportion of amino acids needed by humans. This means that animal proteins provide a balanced profile of essential amino acids that matches the amino acid requirements of the human body.

Option 4, which states that animal proteins are digested easily, is not the main reason why animal flesh is a good source of high-quality proteins. While animal proteins are generally more easily digestible compared to plant