How come your stomach does not get digested? How come corn (if not bitten through) will not get digested and just pass through the system (ever notice corn kernels in your poop?)?
They have protective layers. Bacteria with protective layers can survive stomach acid too (helicobacter pylori, causes stomach ulcers). Protective layers everywhere.
That’s why it’s also important to chew plants – they have a protective coating on the outside, so you need to mush them with your teeth to mechanically destroy (or cause holes in) the protective layer to let the acid dissolve it further.
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