Diseases or other disorders can be passed down through your family so you need to know your families history to know if you are at an increased risk.
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:
The answer is D. parents do not have a qualification