The answer for the first question is B. mucus sweat and tears, all of those are defenses that the body uses when attacked. Now for the second option is A the answer because the first filter that a virus or a desease must pass is indeed the skin. Hope is good for you
Natural selection is species survival and reproduction due to differences in some traits that give them an advantage over others
Answer:
predation
Explanation:
predation
I hop this answer is correct
Answer:
preventing friction between bones