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Cave is a smaller section of a cavern. A song is a smaller part of a tune. Therefore, one is the bigger picture (second section) and the other is the smaller picture (first one) Hope this helps!
I preferably think that background research helps identify many things such as history, records, events, and more which indicates how it relates to the topic
Here's some synonyms for the word doctrine, creed, credo, dogma, belief, teaching, ideology, hope this helped, have an amazing day:)
