Here's why:

* Elements are the simplest pure substances that cannot be broken down further by chemical means. They are made up of only one type of atom.

* Compounds are formed when two or more different elements chemically combine in a fixed ratio.

Since sulfur is found in nature as a single type of atom (S), it is an element.

Regarding homogenous and heterogeneous, these terms describe mixtures, not pure substances like elements:

* Homogeneous mixtures have a uniform composition throughout.

* Heterogeneous mixtures have a non-uniform composition, with distinct parts.

Since sulfur is a pure element, it is neither homogeneous nor heterogeneous.