The correct answer is B.
People over the age of 65 should be as physically active as their health and bodies allow. Everyone ages differently and some will be more able to do higher intensity exercise while others will be able to do low or moderate. Completely depends on the person.
Answer:The immune system is a network of cells, tissues and organs that work together to attack pathogens that try to invade your body. Bacteria, parasites and fungi that may cause infection meet a system of immune soldiers, including T-lymphocytes, macrophages and neutrophils.
Explanation:
Its between C and D for me.But I think D is the answer.
