Check all the characteristics below that describe elements. one type of atom a pure substance more than one type of atom chemically combined elements

one type of atom; a pure substance

Explanation:

An element is defined as a pure substance. Each element is made of one type of particle only which can be an atom or a molecule.  

Example: Copper (Cu), gold (Au), oxygen (O), hydrogen (H), etc. All these elements are made of a single type of atom only.  

kelp are large brown algae that live in cool, relatively shallow waters close to the shore. they grow in dense groupings much like a forest on land. these underwater towers of kelp provide food and shelter for thousands of fish, invertebrates, and marine mammal species.

e) all of the above