An atom or molecule that carries an electrical charge is a(n):

Acne is also known as sebaceous vulgaris.

A common volatile organic compound used in hair spray is:

Cold cream is an example of an oil-in-water emulsion of two immiscible liquids.  

The main food source for acne bacteria is:

The layer of the dermis that houses the nerve endings which provide the body with the sense of touch is found in the:

All of the following are appendages of the skin except:

The simplest form of chemical matter that cannot be broken down without the loss of identity is a(n):

All of the following are examples of primary lesions EXCEPT:

Chemical reactions that are characterized by or formed by giving off heat are: