Answer:
By the production of white blood cells and antibodies. 
Explanation:
The immune system's job is to identify foreign object and to make antibodies and white blood cells to fight said virus.
 
        
                    
             
        
        
        
B - Sebaceous Gland
The Sebaceous Gland is an accessory organ of the integumentary system.
Hope this helps!
 
        
                    
             
        
        
        
Answer:
Mouth.
Esophagus.
Stomach.
The small intestine.
Colon (large intestine)
Rectum.
( hope this helped goodluck! )
 
        
                    
             
        
        
        
<span>The correct answer is Platelet. Platelets are actually thrombocytes which are found in blood and are responsible for clotting the blood in case of an injury. They are recognizable easily for not having nuclei. T-cells, B-Cells and Phagocytes are all types of white blood cells because the differences between them are minor.</span>
        
                    
             
        
        
        
Answer:
Bone marrow is the answer,pls check If I am correct