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Men and almost all animals depends on grass directly or indirectly for their food. Although humans cannot digest the leaves and stems of grasses, many animals can; when eating meat, humans indirectly benefit from the grass that livestock ate. Grain is high in starch content, making it an excellent energy source. Man has developed the grasses of the meadow into high yielding cereal grain crops, including wheat, barley, rye, oats rice and corn. These crops yield more than 2 billion tons of food a year and literally feed the world.

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