Chemists investigated an unknown substance and found it to have the following characteristics:
-Different components could be observed in the substance.
-Different samples of the substance appeared to have different proportions of the components.
-The components could be easily separated using filters and sorting.
Which statement most accurately describes this substance?
A.The substance is a compound.
B.The substance is an element.
C.The substance is a heterogeneous mixture.
D.The substance is a homogeneous mixture.