| Why and where are animals endangered? |
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5.0 |
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| Why Can't Penguins Fly? |
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| Why Chemistry Matters (10 titles) |
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| Why do animals become extinct? |
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5.5 |
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| Why do animals migrate? |
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4.7 |
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| Why Does a Mirror Show Things Backwards? |
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| Why Doesn't the Moon Fall Out of the Sky? |
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| Why Do I? (6 titles) |
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| Why Do I Bleed? |
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3.8 |
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| Why Do I Drool? |
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4.0 |
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| Why Do I Grow? |
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3.9 |
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| Why Do I Itch? |
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3.9 |
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| Why Do I Poo? |
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3.6 |
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| Why Do I Sneeze? |
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4.0 |
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| Why Don't Eyeballs Fall Out? |
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| Why Do We Need Air? |
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3.1 |
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| Why Do We Need Rocks and Minerals? |
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3.5 |
|
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| Why Do We Need Soil? |
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3.5 |
|
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| Why Do We Need Water? |
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2.8 |
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| Why Is Ice Slippery? |
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| Why We Need Carbohydrates |
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| Why We Need Fats |
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| Why We Need Minerals |
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| Why We Need Proteins |
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Canada
USA
