DI 22 Three Fundamental Needs Model
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DI 21 how the Earth has changed over the past 225 million years
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DI 20 world income distribution for 1970 and 1990
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DI 19 the composition of a balanced, nutritional diet.
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DI 18 the formation of two huge “garbage patches” in the Pacific Ocean
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DI 17 a photo of a modern suspension bridge
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DI 16 photograph of a small house in an arctic environment
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DI 15 the cross section of a tree trunk
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DI 14 the probability of depression for people aged between 16 and 70
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DI 13 Maslow’s Hierarchy of Needs, published in 1970
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