What region did scientists think may have been a large sea?

What did populists set their sights on after achieving some success on a local level in the late 1800s?

Black death spread because of what problem in medieval europe? which one is it i need the answer quick . a- overcrowded cities b-too many farm animals c-not enough qualified doctors d-all of the above

In the 1950s and 1960s, chief justice earl warren was a strong advocate for?