The high silica content in grasses and the thick enamel layer on horse teeth are examples of:

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The high silica content in grasses acts as a defense mechanism against herbivores, while the thick enamel on horse teeth is an adaptation to deal with the wear caused by eating high-silica grasses. This dynamic represents an evolutionary arms race, where both predator and prey (or in this case, plant and herbivore) evolve traits in response to each other to gain an advantage.

The High Silica Content in Grasses and the Thick Enamel