I think it's a mixture.
An element is a pure substance composed of only one type of atom and is homogeneous. A compound is a pure substance composed of two or more elements chemically bonded together and is homogeneous. Both elements and compounds are homogeneous in nature.
Sulfur is an element and therefore a homogeneous substance.
It's an element. Check your periodic table.
heterogeneous
compound and element
compound
It is an element.
heterogeneous
Concrete is a heterogeneous mixture.
it is a heterogeneous
Homogeneous mixture
Vinegar is a homogeneous mixture.