Centuries: 2nd century - 3rd century - 4th century
Decades: 190s 200s 210s 220s 230s - 240s - 250s 260s 270s 280s 290s
Years: 238 239 240 241 242 - 243 - 244 245 246 247 248
Births
Deaths
... 1 The production of oxygen 2 Light-dependant reaction 2.1 Cyclic photophosphorylation 2.2 Noncyclic photophosphorylation 3 The Calvin cycle The production ...