That sandwich you're eating? Made from old recycled half eaten sandwiches.
The poop fertilized plants, the plants were harvested, some of them were turned into bread, others fed a pig, and that's what you're eating. Some of the poop decayed and was released as gases into the air, which were then recaptured by the plants, by bacteria in the roots of soybeans, and by Haber-Bosch factories (confusingly also called plants) which made synthetic fertilizer to fertilize the plants further.
You are recycling your sandwich, made from poop, into more poop.
This is the reflection on the disgusting nature of food and its link to the interdependent arising of all things. Your existence is inextricably linked to the existence of the pig and the poop. They are not separate processes; they are different focuses in the same process.
>Half of all the elements that are heavier than iron—such as thorium and uranium—were thought to be made when neutron stars, the superdense remains of burnt-out suns, crashed into one another. Long theorized, neutron star collisions were not confirmed until 2017. Now, however, fresh analysis by Karakas and fellow astronomers Chiaki Kobayashi and Maria Lugaro reveals that the role of neutron stars may have been considerably overestimated—and that another stellar process altogether is responsible for making most of the heavy elements.
(Though the atomic nuclei didn't originate in the poop; they were just passing through. But cobalamin molecules, for example, do originate in poop pretty often.)
If you count CO2 as “poop” the percentages rise but the fossils still are in the lead.
KING CLAUDIUS Alas, alas!
HAMLET A man may fish with the worm that hath eat of a king, and eat of the fish that hath fed of that worm.
KING CLAUDIUS What dost you mean by this?
HAMLET Nothing but to show you how a king may go a progress through the guts of a beggar.
For reference, that’s a Futurama quote.