Answer:
Explanation: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
going to the sun without protection repeated times causes freckles. Belive me my face is full of them.
Everyone feels down at times. The breakup of a relationship or a bad grade can lead to low mood. Sometimes sadness comes on for no apparent reason. Is there any difference between these shifting moods and what is called depression? Anyone who has experienced an episode of depression would probably answer yes.
