someone PLEASE put this in order like starting from the top of the body to the bottom: 
Mucus membrane 
Natural antibiotic(s) 
Immune system 
White blood cells 
Leukocytes 
Lymphatic system
Antigen 
Phagocyte
Lymphocyte
T-cells 
B-cells 
Antibody/antibodies
Fever
Communicable disease 
Infection 
Pathogen
Skin ( as a protective barrier)
vaccine/vaccination 
Stomach 
First line of defense 
Second line of defense 
Third line of defense