Answer:
Sewage Treatment Plants
Explanation:
Just did the test sorry its so late man.
The correct answer of the given question above is option A. The line of defense that his immune system is exhibiting in this situation is the first line of defense. The first line of defense includes the physical or external line of defense of the body that are responsible for inhibiting of the entry of foreign microorganisms. Such include the skin, tears, cilia, mucus, urine flow and even stomach acid.
#1 PROBABILITY is the likelihood that a given event will occur.
I'm not sure on #2, Sorry