A kind of grass has evolved to have very thick,reinforced cell walls,which make the plant very resistant to chewing by panda bears.This characteristic is most likely due to the presence in the grass leaves of

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The thick, reinforced cell walls of the grass suggest the presence of lignin, a complex polymer that strengthens plant cell walls and provides structural support. This is most likely the reason why the grass is resistant to chewing by panda bears.

A Kind of Grass Has Evolved to Have Very Thick,reinforced