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All matter has physical and chemical properties and exists in the form of a:

An example of an ammonia compound that is used to perform chemical services in a salon is

All of the following are examples of primary lesions EXCEPT:

A closed comedo is also known as a blackhead.  

Most organic substances do not burn because they do not cotain carbon.

Ions with a positive electrical charge are considered to be:

A solution with a pH value of 7 indicates a(n):

The largest organ of the human body  is

Melanin provides the skin with enough sun protection to prevent skin damage. 

Elements differ from one another because of the difference in the structure of their: