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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.

$5 - $10 per group Ages 8 - 14 1 to 7 days
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In this activity, learners use sets of cards to assign microorganisms to different groups.

1 cent - $1 per group Ages 8 - 14 45 to 60 minutes