How does the structure of a white blood cell aid in its function?

The function of White Blood Cells (WBC) is to defend the body from various infections. They produce antibodies that help detect and fight the presence of foreign elements (say germs) in the body. They strengthen the defense mechanism, thereby improving the immune system of the body against germs

The flexibility of the plasma membrane allows bacteriophage and increases mobility in pursuit of invaders. Beta cells put out chemical antigens to eliminate invaders chemically. Various white cells display proteins on their plasma surfaces to communicate the composition of the pathogen. White cells (unlike red blood cells) have a nucleus, which allows the synthesis of new chemicals in response to various invaders. 

The moths will eventually become extinct