Answer: They performed a <u><em>Stress Test.</em></u>
Explanation:
Brain tumor can form in the brain cells (as shown), or it can begin elsewhere and spread to the brain. As the tumor grows, it creates pressure on and changes the function of surrounding brain tissue, which causes signs and symptoms such as headaches, nausea and balance problems.
A. iron
Iron also helps with the production of red blood cells as well
