Answer:
Commas! They are used to separate ideas from each other, or be used in place of "and".
Edmund Kells constructed his own x-ray machine.
Answer:
citations
Explanation:
find a credible source ex. medical site. something that has evidence and propaganda like news or newspapers and blogs .do not ever use that.
Answer:
B)
They can make the statements made by secondary sources much more believable.
Explanation:
