How does a hyphen differ from a dash? a hyphen separates a prefix ending in a vowel from a root word beginning with a vowel; a dash does not a hyphen introduces main ideas; a dash separates items in a series a hyphen introduces a long quotation; a dash introduces short quotations a hyphen signals a degree of pause; a dash only signals a dramatic effect

Hyphens and Dashes. A hyphen joins two or more words together while a dash separates words into parenthetical statements. The two are sometimes confused because they look so similar, but their usage is different. Hyphens are not separated by spaces, while a dash has a space on either side

a hyphen introduce a main idea: a dash separates items in a series

a hyphen separates a prefix ending in a vowel from a root word beginning with a vowel; a dash does not

Explanation:

You should use a hyphen to connect a prefix to another word if the prefix ends in a vowel and the base word also begins with one.

e. g. "pre-eminent," "co-own," "anti-immune".

You cannot use a dash with these words.