Answer and Explanation:
The immune system protects the organism against pathogens such as, for example, bacteria and viruses
Steps:
1-A pathogen infects the organism
2-Macrophages engulf and digest pathogens, and subsequently recruits helper T cells
3-T cells recruit cytotoxic B cells
4- B cells generate plasma cells that secrete antibodies including IgA, IgG and IgE
5-Antibodies bind to antigens and these complexes are targeted for phagocytic degradation