sinjibrian

(A) It is matter that has a fixed or definite composition.

(B) Water,  

(C) It does not have a uniform composition throughout the sample.

(D) It is the simplest type of pure substance, containing only one type of atom.

(E) Substances that are physically mixed with uniform composition but not chemically combined.

(F) It contains two or more elements chemically combined in a specific proportion.