The human brain has up to 100 billion neurons (nerve cells)
Answer:
testing contact numbers periodically
Explanation:
That makes most sense to me because calling their doctor serves no purpose, printing out weekly spreadsheet is waste of paper, and making sure one staff has training does not fit the question I think.
Answer:
heart bc it increases the heart rate
Letter C! One hour, children must have one hour of physical excercise each day.
