When people eat food containing gluten, material found in wheat product, their immune system <span>damages or destroys their villi, which are important because these are responsible for "pushing" the food down. </span>
Galalpagos Island finches have different shaped beaks which can consume different foods. The more food sources a number of species can tap into, the less scarcity they have to deal with within one--less competition, more food overall...and if that certain genetic trait helps a finch survive, that trait is going to be perpetuated by its offspring. (natural selection)
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