Answer:
<h3>A DOI, or Digital Object Identifier, is a string of numbers, letters and symbols used to permanently identify an article or document and link to it on the web. A DOI will help your reader easily locate a document from your citation.</h3>
El Salvador fue fundado en 1821
Their major gods and goddesses lived at the top of
Mount Olympus
the highest mountain in Greece, and myths described their lives and actions.
