Brendan participates in the national physical fitness program every year. each year, he scores in the highest percentile on his tests. what do brendan's high fitness scores show?

The high fitness score of Brendan shows that he is fit.

Explanation:

Fit is a term, which signifies that to be in good physical shape. The term is generally related to physical activity and signifies the physical fitness or the mental and physical well-being of a person.  

In the given case, Brendan always acquires the highest percentage on his fitness test, this shows that he is in good physical shape or it can be stated that Brendan is fit.  

the answer is nerve impulses.

good