Comma Between Compound Subject and Predicate

A compound subject is a subject which lists more than one thing. Commas may be used within the compound subject to separate the nouns, but should not be used between the subject and the predicate of the sentence.

Some frequent causes of headaches are, stress, lack of exercise and dehydration.

The comma between are and stress should be removed because it separates the predicate from the subject. The other comma is grammatically correct.

Literacy and good writing skills, are necessary in most careers.

Time and space, are fascinating fields of study.