Vinnie is standing on one leg with his arms in the air. The sense in his inner ear helps keep him balanced so he has less chance of falling over.

The correct answer is - vestibular.

Explanation:

Vestibular is the inner ear that helps in the sense of balance in vertebrates, that helps in the keeps an individual balanced. The vestibular system is the part of the inner ear that coordinate between movement with balance.

It is also helps in spatial orientation in an individual. It is something that helps in the sensing the change in orientation and movement that leads to balancing. Vinnie is standing in one leg with arms in the air, it is possible due to the vestibular sense that prevent falling.

Thus, the correct answer is - vestibular.

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