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the animal cannot digest, such as bones ; [ ] food material after all the nutrients have been extracted, for example cellulose or lignin ; ingested matter which would be toxic if it remained in the digestive tract; and dead or excess gut bacteria and other endosymbionts . amphibians, reptiles, and birds
bilaterian body plan , the coelom , and metamerism , in which the body was built of repeated "modules" which could later specialize, such as the heads of most arthropods , which are composed of fused, specialized segments. contents development see also references external links development main articles...
https://en.wikipedia.org/wiki/Anus
the animal cannot digest, such as bones ; [ ] food material after all the nutrients have been extracted, for example cellulose or lignin ; ingested matter which would be toxic if it remained in the digestive tract; and dead or excess gut bacteria and other endosymbionts . amphibians, reptiles, and birds
bilaterian body plan , the coelom , and metamerism , in which the body was built of repeated "modules" which could later specialize, such as the heads of most arthropods , which are composed of fused, specialized segments. contents development see also references external links development main articles...
https://en.wikipedia.org/wiki/Perianal