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I think that in this case you may want to keep both ways open. Diagrams are usually allright in academic and technical contexts, but you mentioned this is a college assessment and your ability to...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/44637 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/44637 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I think that in this case you may want to keep both ways open. Diagrams are usually allright in academic and technical contexts, but you mentioned this is a college assessment and your ability to write clearly is going to be graded. I would include the image for clarity, while describing the contents of the image at the same time. Writing an accurate description on such topic is surely a difficult task, but you are probably supposed to undertake it anyway.