Final answer:
The hamstrings, including biceps femoris, semitendinosus, and semimembranosus, are the group of muscles on the posterior thigh responsible for flexing the knee.
Explanation:
The group of muscles found on the posterior thigh that flexes the knee is known as the hamstrings. These muscles include the biceps femoris, semitendinosus, and semimembranosus. The hamstrings play a crucial role in knee flexion and are essential for various leg movements.
Learn more about Hamstrings here:
https://brainly.com/question/28880683
