A chemical combination of matter in definite (fixed) proportions is a

The top of the papillary layer where it joins the epidermis is the:

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

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

The main food source for acne bacteria is:

Base sections are offset from each other row by row, to prevent noticeable splits, in which wrapping pattern?

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

An unstable physical mixture of two or more immiscible substances is a(n):

A freckle is an example of a mark on the skin called a:

A closed comedo is also known as a blackhead.