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252

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

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

Years: 247 248 249 250 251 - 252 - 253 254 255 256 257


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Photosynthesis

... fact derived from the carbon dioxide, but rather from the water molecules which are consumed in the reaction. This was first proposed in the 1930s by C. B. van Neil of ...

 
 
 
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