The document discusses several biological terms: 1) The I band is an area of the sarcomere with only thin filaments. 2) The ileum is the last section of the small intestine that absorbs nutrients and water. 3) Imaginal disks are clusters of undifferentiated cells in insect larvae that form organs during metamorphosis. 4) Immune adherence is when antibodies and complement coat microbes, allowing phagocytes to more easily destroy pathogens. 5) Immunization is exposing an organism to antigens to stimulate immunity without causing disease.