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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