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In this activity (on pages 24-34), learners explore the four-part stomach of cows (and other grazing animals called ruminants), and compare it to the human one-part stomach and its digestive process. In Part One learners color, cut out, and assemble the parts of either a human or cow digestive system. In Part Two learners recreate ruminant digestion by letting wet cut grass or shredded lettuce leaves decay, and use their sense of smell to...

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