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254

Centuries: 2nd century - 3rd century - 4th century

Decades: 200s 210s 220s 230s 240s - 250s - 260s 270s 280s 290s 300s

Years: 249 250 251 252 253 - 254 - 255 256 257 258 259


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Photosynthesis

... exactly reversed: oxygen plus sugar yields carbon dioxide plus water plus energy. However, it is important to note that this chemical equation is highly simplified; in ...

 
 
 
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