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Natural history

Natural history is the study of the history and processes of living things. It history is defined differently, depending on the source. Although most definitions include botany and zoology, others extend the topic to include paleontology and biochemistry, as well as parts of geology and physics.



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Quadratic formula

... by the quadratic equation touches the x-axis in a single point.) If the discriminant is positive, then there are two different solutions x, both of which are real. ...

 
 
 
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