Decades: 1150s 1160s 1170s 1180s 1190s - 1200s - 1210s 1220s 1230s 1240s 1250s
Years: 1196 1197 1198 1199 1200 - 1201 - 1202 1203 1204 1205 1206
Births
Deaths
... to reduce carbon dioxide into carbohydrates. Van Neil's proposal was confirmed 20 years later by using the O18 isotope of oxygen as a tracer label to follow the fate of ...