<a href="https://en.wikipedia.org/wiki/Anaerobic_organism" class="extiw" title="en:Anaerobic organism">anaerobic</a> carbon oxygen <a href="https://en.wikipedia.org/wiki/Biogeochemical_cycle" class="extiw" title="en:Biogeochemical cycle">cycle</a> (<b>P</b> = <a href="https://en.wikipedia.org/wiki/Primary_producers" class="extiw" title="en:Primary producers">producer</a>, <b>K</b> = <a href="https://en.wikipedia.org/wiki/Consumers_(food_chain)" class="extiw" title="en:Consumers (food chain)">consumer</a>, <b>D</b> = <a href="https://en.wikipedia.org/wiki/Decomposer" class="extiw" title="en:Decomposer">decomposer</a>)
<a href="//commons.wikimedia.org/wiki/User:Sponk" title="User:Sponk">Sponk</a> (<a href="//commons.wikimedia.org/wiki/User_talk:Sponk" title="User talk:Sponk"><span class="signature-talk">talk</span></a>)
This <i>W3C-unspecified</i> <a href="https://en.wikipedia.org/wiki/Vector_images" class="extiw" title="w:Vector images">vector image</a> was created with <a href="https://en.wikipedia.org/wiki/Inkscape" class="extiw" title="w:Inkscape">Inkscape</a> .