a person who has a weakened immune system may not be able to fight against infection because\no pathogens…

a person who has a weakened immune system may not be able to fight against infection because\no pathogens may enter the body and cause illness.\no phagocytes may enter the body and cause illness.\no normal cells crowd out unhealthy cells.\no antibodies production is increased.

a person who has a weakened immune system may not be able to fight against infection because\no pathogens may enter the body and cause illness.\no phagocytes may enter the body and cause illness.\no normal cells crowd out unhealthy cells.\no antibodies production is increased.

Answer

Brief Explanations:

The immune system defends against pathogens. A weakened immune system can't stop pathogens from entering and causing illness. Phagocytes are part of the immune - defense, normal cells don't crowd out unhealthy ones in this context, and antibody production would decrease or be impaired in a weakened immune system.

Answer:

A. pathogens may enter the body and cause illness.