What are the differences between the prefixes "intra-", "inter-" and "intro-"?

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Answer

Hi, yes these are prefixes. Next time go to www.thefreedictionary.com 
inter = between, among . Examples ;intervene come between, international between nations, interjection a statement thrown in
intra and intro = within . Examples; intramural within a school, introvert [ person who keeps  his feelings, ideas within himself]

Answer

Lots. You should do a bit of dictionary work.