This question asks us to match each type of defensive cell with its function or description. So let's just work through this list and make the pears. All right. So for number one, we're looking for a cell type that attacks infected body cells. So we know that this must be sido toxic T cells. T cells are responsible for cell mediated immune responses. Um, there's helper T cells and sido toxic T cells. So sino toxics T cells are activated by helper T cells, and the role of the side of toxic T cell is to kill infected body cells. Okay, so let's make that pair done. All right, Number two, a cell that secretes antibodies. So, um, B cells are the cells that secrete antibodies. These cells are responsible for the human role immune response, which defends primarily against bacteria and viruses present in bodily fluids. As their mechanism of response. They secrete antibodies, and the secretion is stimulated by helper T cells so we can make that that pair okay, a white blood cell that engulfs cells or molecules. So now we're gonna be switching gears a little bit talking about innate immunity, and Nate immunity is a set of defenses that are active immediately upon infection and are the same whether or not the pathogen has been encountered previously. One of the methods of protecting the body in this non specific manner includes Vegas psychosis by cells like macro features and neutrophils. And, um so this is exactly what we're looking for. So option three matches with bigger sites, All right, a general name for B or T cells, so we know that this answer is going to be lymphocytes. Lymphocytes are the white blood cells that are responsible for adaptive immunity, and these cell types include B cells and T cells, so that has to be the match. All right, Option five, A cell type that initiates the secondary immune response. So this is going to be memory cells. Memory cells are formed during the primary immune response. They are a subset of the B cells from the clonal expansion of the B cell that initially bound to the anti gen of interest. Some of the B cells that are produced will form antibodies, and others will become memory B cells, helping the body responded faster. The next time the same answer gin is presented So we match five with F and then number six this almost commonly attacked by HIV. So these air gonna be helper T cells? We talked a little bit earlier about how important helper T cells are for, um, immune responses, especially for the role in stimulating, um B cells to produce antibodies as well a cider toxic T cells to destroy infected body cells. So this is the heart of the problem with HIV is that it totally handicaps the immune system by wiping out the population of helper T cells in the body.