are discharged through the anus or cloaca during defecation. This process requires pressures that may reach 100 mmHg (13.3 kPa) in humans and 450 mmHg (60 kPa) in penguins. The forces required to expel the feces are generated through muscular contractions and a build-up of gases inside the gut, prompting the sphincter to relieve the pressure and release the feces.

Ecology

After an animal has digested

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