Organs playing some role in digestion: the breaking down of food into smaller components that can be up-taken and used as source of energy or stucture.

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Is there any mechanical digestion that occurs once food/chyme enters the small intestine?

Does mechanical digestion occur in small intestines and, if so, how does it occur? I found some sources that say digestion happens mechanically and chemically in the small bowel, and others that say ...
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How is the appropriately-stratified gut microbiome acquired in organisms performing horizontal transmission?

I am studying horizontal transmission of primary symbionts in insect reproduction. This reminded me of an earlier question I had asked, in which I learned that humans analogously acquired their ...
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Why does human waste still contain nutrients for plants?

The question is motivated by the Martian movie, in which the main character (Mark Watney) uses human waste to fertilize Martian soil and grow potatoes. Following the idea that energy can only ...