Which of the following are the natural barriers that keep infection out?
question 2 options:

a)

tears and skin

b)

masks

c)

mucous membranes and skin

d)

both a and c

how do pathogens spread?
question 3 options:

a)

indirect contact

b)

direct contact

c)

animal or insect

d)

contaminated food or water

e)

all of the above

The answer to the first question is mucous membranes and skin

The answer to the second question is All of the above

Hope this helps! Good luck ;)

answer; i believe that the correct answer is (b) melosis; plz check first.good luck

answer: b: experiments that showed that all cells are similar in how they metabolize and in their composition

explanation: