Agricultural communities settled where they did because there was a water source near by for growing crops. It is very hard to grow plants or raise animals without a water source. People also settled near water sources so they could travel on ships and trade with other communities along the same water source. The people in the community also needed water to stay hydrated and to wash dirty clothes or to bathe.
Answer:
migration; diffusion
Explanation:
With the migration of people from fertile areas, knowledge of agriculture spread by diffusion.
In September 1939 with the beginning of World War II German U-boat operations got under way against allied forces the allies responded to the U-boat threat with a number of counter measures
<span>The combined affect of protection of ships by convoys harassment of U-boats by airplanes and other anti-submarine warfare measures reduced the ability of the U-boats to cut Britain off from her </span>
<span>suppliers in North America In order to assess the effectiveness of the allied response it is first necessary to look at the U-boats In looking at the U-boats it is not only necessary to look at the </span>
<span>various types of U-boats and their deployment but also to look at the Germans goals and the tactics that they employed in an attempt to reach those goals </span>
<span>The Treaty of Versailles ending world war one prohibited Germany from having any U-boats When the treaty was changed under The Anglo-German Naval agreement one of the things that the </span>
<span>Germans did to rebuild their navy was to rebuild the U-boat wing Their first U-boats were for general sea-going and coastal abilities the U-boats first built for this purpose were types I and II The type I had a surface speed of 1775 knots and 825 knots submerged on electric engines for armament it had 41 inch </span>
<span>and 22 mm anti-aircraft guns and six torpedoes In comparison the type II had speeds of 13 knots surfaced and 7 knots submerged with three torpedoes and one 20 mm anti-aircraft gun The type II was </span>
<span>smaller than the type I </span>
