What was the first line of evidence that led early investigators to suspect that the continents were once connected?

In italy, the distance between milan in the north and palermo,sicily, in the south is about 550 miles. in the united states, the distance betweenboston, massachusetts, and savannah, georgia, is about 900 miles. do you think the american revolutionaries of 1776 in the 13 colonies faced some of the same challenges as the patriots who struggled for italian unity in the 1860s?  

What deadly disease cost many workers their lives before dr. william gorgas found a treatment?

Enter the word you receive when you completed the river valley civilizations activity