What sonar device let morse code messages be sent underwater from a submarine in 1915?

Select the correct answer. how did agricultural advances affect chinese society during the middle ages? a. it led to population growth. b. it decreased life expectancy. c. it lowered industrial operations. d. it resulted in more people moving to rural areas.

What does it mean in the declaration of independence for cutting off our trade with all parts of the world

Why did french and austrian troops stops revolts in spain and italy