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What period did “Grass” Evolve and spread?

April 26, 2017Biology evolve grass Mathematics period spread

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What period did “Grass” Evolve and spread?

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Depends on what “Grass” you are referring to. If you mean the monocotyledonous grass (flowering), they did no develop until the Cretaceous period in the Mesozoic era. Anything before would be during the paleozoic period, but it would not be anything you or I might call grass (ferns etc.).