Decades: 1180s 1190s 1200s 1210s 1220s - 1230s - 1240s 1250s 1260s 1270s 1280s
Years: 1234 1235 1236 1237 1238 - 1239 - 1240 1241 1242 1243 1244
Births
Deaths
... reaction The first stage of the photosynthetic system is the light-dependant reaction, which converts solar energy into chemical energy. Light absorbed b ...