The in the brain subconsciously provides timing and patterns of smooth movement of skeletal muscle and aids in maintaining posture and balance.

the answer is 100% density i've answered this question before and done the quiz myself.

those characteristics are cellular organization, reproduction, metabolism, homeostasis, heredity, response to stimuli, growth and development, and adaptation through evolution. some things, such as a virus, demonstrate only a few of these characteristics and are, therefore, not alive