Which is one way that skin protect the body from infection?
a. skin keeps germs out of the body.
b. skin keeps mucus out of the body.
c. skin directs sensory messages.
d. skin produces complement proteins.

The correct answer is option A.

Explanation:

The skin refers to the largest organ of the body and is the most essential barrier against the infections. It is the first line of defense in safeguarding the internal tissues from the harmful germs. In case, when the skin gets damaged due to an injury, it becomes easier for the germs to get within the body and leads to infection.  

The skin can also get damaged due to cancer treatments like radiation therapy or surgery, and some other procedures like administering catheters, all these things can make it easy for the germs to get in. However, if the germs are able to cross through the first line of defense, the work of protecting the body from the infections get shifts to the immune system.  

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.