Question 3(Multiple Choice Worth 5 points) (07.06 MC)
Which of the following best describes an example of a specific internal response to harmful bacteria?
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.

A the skin is the bodies first line of defense

Explanation:

The first line of defence is non-specific and aims to stop microbes from entering the body. 

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

Explanation:

The question is talking about internal response to bacteria so we have to look at what happens inside the body pertaining to bacterial infection, so the answer is "Antigens trigger the production of antibodies, which mark bacteria for destruction".

imagine a line passing through the center of earth that goes through both the north pole and the south pole. this imaginary line is called an axis. earth spins around its axis, just as a top spins around its spindle. this spinning movement is called earth's rotation. at the same time that the earth spins on its axis, it also orbits, or revolves around the sun. this movement is called revolution.

because it travels in smaller waves then all other colors, causing it to be the most visible color