Dear Knowsnothing,
Each of the first four OT books (Gen-Num) is a skilful collation of writings produced by identifiable groups. The collation was produced some time after the Babylonian Captivity ended. At times, the collator (possibly Ezra? speculation) intertwined the separate narratives into a single account. A clear example of this is in the Flood story, which knits together two distinct and separate threads.
http://www.jwstudies.com/Two_Flood_Stories.pdf (displays the two flood sources: J and P -- the same two sources for the two Creation stories).
I strongly suggest you read books such as "Who Wrote the Bible?" by Friedman. If you want to see it more clearly, Friedman has a companion book: "The Bible with Sources Revealed".
Writing came into vogue as a means of communication several centuries after the Moses event. Even then it was adopted by only a small group of the elite; so what Scriptures you read are their views.
Broadly speaking, chapters 2 to 7 of Daniel are in Aramaic, the rest is in Hebrew. There are also differences between the MT (Hebrew) and the LXX (Greek). Further, the version and application of Dan 9 used by the WTS is based on the text by Theodotian. See my note at:
http://www.jwstudies.com/Critique_of_GM_on_Daniel_9.pdf
A book that applies literary criticism to a comparison of the MT and the LXX of Daniel is: "Aramaic Daniel and Greek Daniel: A Literary Comparison", by T. J. Meadowcroft.
Today it is widely accepted that Daniel was compiled during the 2nd century BCE, some 400 years after the neo-Babylonian period.
I did not include Deuteronomy in the above list since that is not a compilation of writings by those priest/scribes I mentioned. The origins of Deuteronomy lie with the scroll "discovered" by priests at the time of Josiah and it was further worked on during the neo-Babylonian period. The priests created it to enforce their religious practices, not a record of something that had really happened in the past. (They always wrote history with their eyes firmly fixed on the present. History was written to shape the present). It is likely that Baruch (Jeremiah's scribe) played a big role in producing Deuteronomy. At the same time, they wrote their history, for obvious purposes, extending Deuteronomy through Joshua-Judges-Samuel-Kings. The Chronicler wrote Chronicles some centuries after the neo-Babylonian period.
Bible study is far more exciting and challenging that any spoon feeding from the WTS.
Doug