In 1919 germany's ew democratic government called , was set up to replace the previous imperial government

The Weimar Republic

Explanation:

After the fall of Imperial Germany in WW1 the new democratic government recognized called the Weimar Republic emerged but later on because of numerous reasons failed and then Adolf Hitler took over the nation later becoming Nazi Germany

radioactive dating, also known as  radioisotope dating  is a process that in  estimating the approximate  age  of  rocks. these data can be analyzed from  the studies dealing with the  decay of the radioactive elements that are present in these rocks. in nature, there are a few types of materials or atoms which are quite unstable and they spontaneously decay or breakdown to form other kinds of atoms.

the answer is c. to explore the louisiana purchase