Answer:
C. Poorly functioning immune system
Explanation:
Being underweight would basically mean that you aren't receiving enough nutrition for your body, causing your immune system to weaken from it.
1.)Changes in behavior may include mild memory loss, mood swings, or intense emotional outbursts. Tumor location, medications (such as chemotherapy and steroids), and stressful life situations can influence behavior.
2.)General signs and symptoms caused by brain tumors may include: New onset or change in pattern of headaches. Headaches that gradually become more frequent and more severe. Unexplained nausea or vomiting
3.)Blood tests can also give your doctor an idea of how well your organs are functioning and if they've been affected by cancer. Examples of blood tests used to diagnose cancer include: Complete blood count (CBC). This common blood test measures the amount of various types of blood cells in a sample of your blood.
hope this helps :) sorry if it doesn't
The answer is mitochondria because it is the power house of the cell and makes the energy