Question

Which of the following best describes an example of a specific internal response to harmful bacteria? (2 points)

Skin serves as a physical barrier that prevents bacteria from entering the body.

Saliva contains enzymes that destroy bacteria and prevent infection.

Bacterial infection causes the release of histamine, which leads to inflammation and swelling.

Antigens trigger the production of antibodies, which mark bacteria for destruction.

Answer 1

Hint:
All the mentioned responses are defense mechanisms against pathogens.
Note the keyword "specific" in the question makes the distinction between the choices.

Answer 2

im still so confusedddd @mathmate

Answer 3

Further Hint:
Here's a description of the body's three lines of defense against harmful bacteria that I suggest you read and understand, after which, you will know which one is against specific pathogen.

Answer 4

is it D

Answer 5

@mathmate

Answer 6

Are you sure?
If you are, please explain how you got your choice.

If not, read the following:

http://www.austincc.edu/apreview/EmphasisItems/Inflammatoryresponse.html

http://tle.westone.wa.gov.au/content/file/969144ed-0d3b-fa04-2e88-8b23de2a630c/1/human_bio_science_3b.zip/content/004_internal_defence/page_02.htm

(sorry, I forgot to post the link in "further hints").

Answer 7

is it skin ? @mathmate

Answer 8

specific: restricted to a particular individual, situation, relation, or effect (Merriam-Webster)

skin is a physical barrier, it will guard against any bacteria, chemical, so it is not specific.
As I said, all the choices are part of the body's defense mechanisms.
Specific body defense means that it will work on a particular pathogen, not just any. In other words, it won't harm the "wrong guy".
Look carefully for the word "specific" in the above links and you'd be sure to find your answer required.

Answer 9

I agree with math mate.