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176

Centuries: 1st century - 2nd century - 3rd century

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Years: 171 172 173 174 175 - 176 - 177 178 179 180 181


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Photosynthesis

... requires a source of hydrogen with which to reduce carbon dioxide into carbohydrates. Van Neil's proposal was confirmed 20 years later by using the O18 isotope of oxygen ...

 
 
 
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