Directly The immune system is designed to defend the body against foreign or dangerous invaders. Such invaders include
Microorganisms (commonly called germs, such as bacteria, viruses, and fungi)
Parasites (such as worms)
Cancer cells
Transplanted organs and tissues
To defend the body against these invaders, the immune system must be able to distinguish between
What belongs in the body (self)
What does not (nonself or foreign) normal immune response consists of the following:
Recognizing a potentially harmful foreign antigen
Activating and mobilizing forces to defend against it
Attacking it
Controlling and ending the attack
If the immune system malfunctions and mistakes self for nonself, it may attack the body’s own tissues, causing an autoimmune disorder, such as rheumatoid arthritis, Hashimoto thyroiditis, or systemic lupus erythematosus (lupus).
The answer is C. Trachoma
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Dichotomous
A dichotomous key is very easy to use because it provides only two choices.
A dichotomous key is a tool that helps the user to determine the identity of unknown organisms or objects. A dichotomous key has two choices that direct the user to the correct name and the right information or characteristics of a given organism. Dichotomous key is used by scientists to place organisms to the group they belong to and it is very helpful when two species or organisms are very similar to one another
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