Walking across a tightrope is mostly controlled by the cerebrum cerebellum brain stem bronchiole

The given blank can be filled with cerebellum.

Explanation:

The part of the brain present at the posterior end of the brain is known as the cerebellum, that is, just underneath the cerebrum. It is smaller in comparison to cerebrum. However, it is an essential component of the brain. It controls movement, balance, and coordination, that is, how the muscles work in harmony. It is because of the presence of cerebellum, one can stand straight, move around, and can keep the balance.

essentially, one bacterial cell splits into two daugurer cells. bacterial offspring don't need or get care from their parents because they are in a sense their own parents. that said, some bacteria can and do depend on other bacteria especially in harsh environments such as bacterial microfilms in hot water tanks.