Semret is walking across a balance beam. which part of his brain is him stay balanced?

The part of the brain that is related to balance is the cerebellum.

Explanation:

 The cerebellum is located below the brain. He is responsible for coordinating body movements. It is responsible for body balance, as it is connected to some channels of the inner ear. It also maintains muscle tone, that is, regulates the degree of muscle contraction of the resting muscles.

  The cerebellum works in synergy with the ear. This "partnership" that helps balance. Inside our ear, more precisely in our inner ear, is the vestibular apparatus, also known as the labyrinth, which is formed by the utricle, saccule, and semicircular canals. Through the labyrinth and its components, together with the cerebellum, the human being can maintain this balance when walking, and in this case, when walking on some wire or platform that needs a more accurate balance.