When did the following event happen?
Dolly the sheep becomes the first mammal to be successfully cloned.
Select a space in the timeline below.
1869
Dmitri Mendeleev creates the Periodic table, a system for tabulating the chemical elements.
Note:
BCE means that the date is the number of years before the current era (CE/AD).
c. is short for 'circa' and indicates that the date is considered approximate.