SCIENCE
BOTANY
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 Question 
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 According to the passage, what was the first great step toward the practice of agriculture? 
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  The invention of agricultural implements and machinery 
 
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  The development of a system of names for plants 
 
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  The discovery of grasses that could be harvested and replanted 
 
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  The changing diets of early humans 
 
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 Explanation: 
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