I would say all but A, but if only one answer it is, I would say C
<h3>Internal resistance</h3>
<em>Internal resistance refers to opposition to flow of current offered by </em><em> cells and batteries themselves resulting the generation of heat. Internal resistance is measured in Ohms. </em>
<h3><em>tq</em><em> </em><em>hOpE </em><em>it</em><em> </em><em>helps</em><em> </em></h3>
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
I believe the correct answer is B: The prevention of second-hand smoke. Hope this helped!
-TTL
