Answer:White blood cells fight infections and diseases caused by:1. Bacteria2. Viruses3. Fungi4. Parasites5. Foreign substances or allergensWhite blood cells, also known as leukocytes, are part of the immune system. They:1. Recognize pathogens2. Engulf and destroy harmful cells3. Produce antibodies4. Activate immune responsesMain types of white blood cells:1. Neutrophils2. Lymphocytes3. Monocytes4. Eosinophils5. BasophilsThey play a crucial role in protecting the body against infections and diseases!