Cells are the smallest units capable of sustaining life, and they make up virtually every aspect ...
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Praise for the previous edition:"e;...well-developed...clear and detailed...useful at the sec...
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Until John Wilkes Booth killed Abraham Lincoln, the assassination of a U.S. President was conside...
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Praise for the previous edition:SSLI "e;Honor Book,"e; Science, Grades 712 categorySociet...
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Composed of the heart, blood vessels, and blood, the circulatory system delivers oxygen and nutri...
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A great deal of what is known about genetics and inheritance is thanks to what has been learned b...
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Why are some people lactose intolerant? What happens to the brain during and after a concussion? ...
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Computers and technology play central roles in our lives for work, entertainment, communication, ...
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Explore the human body from head to toe with fun facts for ages 9 to 12Human bodies come in man...
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