I have to prepare a diagram of an ecosystem (e.g., boreal forest, river, coastal rain forest, marine, grasslands) and include all components like energy flow, nutrient cycling, the mineral cycle, and the water cycle as well as other terminology. Was having trouble doing this, Im not sure which ecosystem would be the easiest and one that i can understand. Can anyone provide me with examples of any of the following ecosystems that I can give reference to and any suggestions on which one I should do?

These may help you.

https://www.google.com/search?source=hp&ei=d0ZeW76pCIHAtQWo6pGwBQ&q=+diagram+of+an+ecosystem+&oq=+diagram+of+an+ecosystem+&gs_l=psy-ab.3..0i22i30k1l10.5505.5505.0.6637.3.2.0.0.0.0.140.140.0j1.2.0....0...1.1.64.psy-ab..1.2.277.6..35i39k1.138.Uft38MX_SRM